Merge "Merge remote-tracking branch 'origin/5.15' into dev"

2020-02-28 08:40:53 +01:00 · 2020-02-28 08:40:53 +01:00 · 60f12c58a0
commit 60f12c58a0
parent 1ba46c9b63 a450cce6b6
107 changed files with 1109 additions and 562 deletions
--- a/examples/embedded/flightinfo/flightinfo.cpp
+++ b/examples/embedded/flightinfo/flightinfo.cpp
@ -144,7 +144,7 @@ public:
 private slots:

    void handleNetworkData(QNetworkReply *networkReply) {
-        if (!networkReply->networkError()) {
+        if (!networkReply->error()) {
            if (!mapReplies.contains(networkReply)) {
                // Assume UTF-8 encoded
                QByteArray data = networkReply->readAll();
--- a/examples/embedded/lightmaps/slippymap.cpp
+++ b/examples/embedded/lightmaps/slippymap.cpp
@ -162,7 +162,7 @@ void SlippyMap::handleNetworkData(QNetworkReply *reply)
 {
    QImage img;
    QPoint tp = reply->request().attribute(QNetworkRequest::User).toPoint();
-    if (!reply->networkError())
+    if (!reply->error())
        if (!img.load(reply, 0))
            img = QImage();
    reply->deleteLater();
--- a/examples/network/blockingfortuneclient/fortunethread.cpp
+++ b/examples/network/blockingfortuneclient/fortunethread.cpp
@ -103,7 +103,7 @@ void FortuneThread::run()
 //! [6] //! [8]

        if (!socket.waitForConnected(Timeout)) {
-            emit error(socket.socketError(), socket.errorString());
+            emit error(socket.error(), socket.errorString());
            return;
        }
 //! [8] //! [11]
@ -115,7 +115,7 @@ void FortuneThread::run()

        do {
            if (!socket.waitForReadyRead(Timeout)) {
-                emit error(socket.socketError(), socket.errorString());
+                emit error(socket.error(), socket.errorString());
                return;
            }

--- a/examples/network/doc/src/fortuneclient.qdoc
+++ b/examples/network/doc/src/fortuneclient.qdoc
@ -89,7 +89,7 @@

    The only QTcpSocket signals we need in this example are
    QTcpSocket::readyRead(), signifying that data has been received, and
-    QTcpSocket::error(), which we will use to catch any connection errors:
+    QTcpSocket::errorOccurred(), which we will use to catch any connection errors:

    \dots
    \snippet fortuneclient/client.cpp 3
@ -118,11 +118,11 @@

    \li \e{An error occurs.} We need to inform the user if the connection
    failed or was broken. In this case, QTcpSocket will emit
-    \l{QTcpSocket::error()}{error()}, and \c Client::displayError() will be
+    \l{QTcpSocket::errorOccurred()}{errorOccurred()}, and \c Client::displayError() will be
    called.
    \endlist

-    Let's go through the \l{QTcpSocket::error()}{error()} case first:
+    Let's go through the \l{QTcpSocket::errorOccurred()}{errorOccurred()} case first:

    \snippet fortuneclient/client.cpp 13

--- a/examples/network/download/main.cpp
+++ b/examples/network/download/main.cpp
@ -175,7 +175,7 @@ void DownloadManager::sslErrors(const QList<QSslError> &sslErrors)
 void DownloadManager::downloadFinished(QNetworkReply *reply)
 {
    QUrl url = reply->url();
-    if (reply->networkError()) {
+    if (reply->error()) {
        fprintf(stderr, "Download of %s failed: %s\n",
                url.toEncoded().constData(),
                qPrintable(reply->errorString()));
--- a/examples/network/downloadmanager/downloadmanager.cpp
+++ b/examples/network/downloadmanager/downloadmanager.cpp
@ -162,7 +162,7 @@ void DownloadManager::downloadFinished()
    progressBar.clear();
    output.close();

-    if (currentDownload->networkError()) {
+    if (currentDownload->error()) {
        // download failed
        fprintf(stderr, "Failed: %s\n", qPrintable(currentDownload->errorString()));
        output.remove();
--- a/examples/network/fortuneclient/client.cpp
+++ b/examples/network/fortuneclient/client.cpp
@ -121,7 +121,7 @@ Client::Client(QWidget *parent)
 //! [2] //! [3]
    connect(tcpSocket, &QIODevice::readyRead, this, &Client::readFortune);
 //! [2] //! [4]
-    connect(tcpSocket, QOverload<QAbstractSocket::SocketError>::of(&QAbstractSocket::error),
+    connect(tcpSocket, &QAbstractSocket::errorOccurred,
 //! [3]
            this, &Client::displayError);
 //! [4]
--- a/examples/network/googlesuggest/googlesuggest.cpp
+++ b/examples/network/googlesuggest/googlesuggest.cpp
@ -209,7 +209,7 @@ void GSuggestCompletion::preventSuggest()
 void GSuggestCompletion::handleNetworkData(QNetworkReply *networkReply)
 {
    QUrl url = networkReply->url();
-    if (networkReply->networkError() == QNetworkReply::NoError) {
+    if (networkReply->error() == QNetworkReply::NoError) {
        QVector<QString> choices;

        QByteArray response(networkReply->readAll());
--- a/examples/network/http/CMakeLists.txt
+++ b/examples/network/http/CMakeLists.txt
@ -28,6 +28,16 @@ target_link_libraries(http PUBLIC
    Qt::Widgets
 )

+if(ANDROID AND TARGET Qt::AndroidExtras)
+    target_compile_definitions(http PUBLIC
+        REQUEST_PERMISSIONS_ON_ANDROID
+    )
+
+    target_link_libraries(http PUBLIC
+        Qt::AndroidExtras
+    )
+endif()
+
 install(TARGETS http
    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
--- a/examples/network/http/http.pro
+++ b/examples/network/http/http.pro
@ -1,4 +1,8 @@
 QT += network widgets
+android: qtHaveModule(androidextras) {
+    QT += androidextras
+    DEFINES += REQUEST_PERMISSIONS_ON_ANDROID
+}

 HEADERS += httpwindow.h
 SOURCES += httpwindow.cpp \
--- a/examples/network/http/httpwindow.cpp
+++ b/examples/network/http/httpwindow.cpp
@ -249,7 +249,7 @@ void HttpWindow::httpFinished()
        return;
    }

-    if (reply->networkError()) {
+    if (reply->error()) {
        QFile::remove(fi.absoluteFilePath());
        statusLabel->setText(tr("Download failed:\n%1.").arg(reply->errorString()));
        downloadButton->setEnabled(true);
--- a/examples/network/http/main.cpp
+++ b/examples/network/http/main.cpp
@ -53,11 +53,30 @@
 #include <QScreen>

 #include "httpwindow.h"
+#ifdef REQUEST_PERMISSIONS_ON_ANDROID
+#include <QtAndroid>
+
+bool requestStoragePermission() {
+    using namespace QtAndroid;
+
+    QString permission = QStringLiteral("android.permission.WRITE_EXTERNAL_STORAGE");
+    const QHash<QString, PermissionResult> results = requestPermissionsSync(QStringList({permission}));
+    if (!results.contains(permission) || results[permission] == PermissionResult::Denied) {
+        qWarning() << "Couldn't get permission: " << permission;
+        return false;
+    }
+
+    return true;
+}
+#endif

 int main(int argc, char *argv[])
 {
    QApplication app(argc, argv);
-
+#ifdef REQUEST_PERMISSIONS_ON_ANDROID
+    if (!requestStoragePermission())
+        return -1;
+#endif
    HttpWindow httpWin;
    const QRect availableSize = httpWin.screen()->availableGeometry();
    httpWin.resize(availableSize.width() / 5, availableSize.height() / 5);
--- a/examples/network/loopback/dialog.cpp
+++ b/examples/network/loopback/dialog.cpp
@ -78,7 +78,7 @@ Dialog::Dialog(QWidget *parent)
    connect(&tcpClient, &QAbstractSocket::connected, this, &Dialog::startTransfer);
    connect(&tcpClient, &QIODevice::bytesWritten,
            this, &Dialog::updateClientProgress);
-    connect(&tcpClient, QOverload<QAbstractSocket::SocketError>::of(&QAbstractSocket::error),
+    connect(&tcpClient, &QAbstractSocket::errorOccurred,
            this, &Dialog::displayError);

    QVBoxLayout *mainLayout = new QVBoxLayout;
@ -131,8 +131,7 @@ void Dialog::acceptConnection()

    connect(tcpServerConnection, &QIODevice::readyRead,
            this, &Dialog::updateServerProgress);
-    connect(tcpServerConnection,
-            QOverload<QAbstractSocket::SocketError>::of(&QAbstractSocket::error),
+    connect(tcpServerConnection, &QAbstractSocket::errorOccurred,
            this, &Dialog::displayError);
    connect(tcpServerConnection, &QTcpSocket::disconnected,
            tcpServerConnection, &QTcpSocket::deleteLater);
--- a/examples/network/network-chat/client.cpp
+++ b/examples/network/network-chat/client.cpp
@ -102,8 +102,7 @@ void Client::newConnection(Connection *connection)
 {
    connection->setGreetingMessage(peerManager->userName());

-    connect(connection, QOverload<QAbstractSocket::SocketError>::of(&Connection::error),
-            this, &Client::connectionError);
+    connect(connection, &Connection::errorOccurred, this, &Client::connectionError);
    connect(connection, &Connection::disconnected, this, &Client::disconnected);
    connect(connection, &Connection::readyForUse, this, &Client::readyForUse);
 }
--- a/examples/network/threadedfortuneserver/fortunethread.cpp
+++ b/examples/network/threadedfortuneserver/fortunethread.cpp
@ -65,7 +65,7 @@ void FortuneThread::run()
    QTcpSocket tcpSocket;
 //! [1] //! [2]
    if (!tcpSocket.setSocketDescriptor(socketDescriptor)) {
-        emit error(tcpSocket.socketError());
+        emit error(tcpSocket.error());
        return;
    }
 //! [2] //! [3]
--- a/examples/network/torrent/peerwireclient.cpp
+++ b/examples/network/torrent/peerwireclient.cpp
@ -107,8 +107,8 @@ PeerWireClient::PeerWireClient(const QByteArray &peerId, QObject *parent)
            this, &PeerWireClient::readyRead);
    connect(&socket, &QTcpSocket::disconnected,
            this, &PeerWireClient::disconnected);
-    connect(&socket, QOverload<QAbstractSocket::SocketError>::of(&QTcpSocket::error),
-            this, QOverload<QAbstractSocket::SocketError>::of(&PeerWireClient::error));
+    connect(&socket, &QTcpSocket::errorOccurred,
+            this, &PeerWireClient::errorOccurred);
    connect(&socket, &QTcpSocket::bytesWritten,
            this, &PeerWireClient::bytesWritten);
    connect(&socket, &QTcpSocket::stateChanged,
--- a/examples/network/torrent/torrentclient.cpp
+++ b/examples/network/torrent/torrentclient.cpp
@ -843,7 +843,7 @@ void TorrentClient::initializeConnection(PeerWireClient *client)
            this, &TorrentClient::setupOutgoingConnection);
    connect(client, &PeerWireClient::disconnected,
            this, &TorrentClient::removeClient);
-    connect(client, QOverload<QAbstractSocket::SocketError>::of(&PeerWireClient::error),
+    connect(client, &PeerWireClient::errorOccurred,
            this, &TorrentClient::removeClient);
    connect(client, &PeerWireClient::piecesAvailable,
            this, &TorrentClient::peerPiecesAvailable);
@ -867,7 +867,7 @@ void TorrentClient::removeClient()

    // Remove the host from our list of known peers if the connection
    // failed.
-    if (client->peer() && client->socketError() == QAbstractSocket::ConnectionRefusedError)
+    if (client->peer() && client->error() == QAbstractSocket::ConnectionRefusedError)
        d->peers.removeAll(client->peer());

    // Remove the client from RateController and all structures.
--- a/examples/network/torrent/torrentserver.cpp
+++ b/examples/network/torrent/torrentserver.cpp
@ -80,7 +80,7 @@ void TorrentServer::incomingConnection(qintptr socketDescriptor)
        if (ConnectionManager::instance()->canAddConnection() && !clients.isEmpty()) {
            connect(client, &PeerWireClient::infoHashReceived,
                    this, &TorrentServer::processInfoHash);
-            connect(client, QOverload<QAbstractSocket::SocketError>::of(&PeerWireClient::error),
+            connect(client, &PeerWireClient::errorOccurred,
                    this, QOverload<>::of(&TorrentServer::removeClient));
            RateController::instance()->addSocket(client);
            ConnectionManager::instance()->addConnection(client);
--- a/examples/network/torrent/trackerclient.cpp
+++ b/examples/network/torrent/trackerclient.cpp
@ -165,8 +165,8 @@ void TrackerClient::httpRequestDone(QNetworkReply *reply)
        return;
    }

-    if (reply->networkError() != QNetworkReply::NoError) {
-        emit connectionError(reply->networkError());
+    if (reply->error() != QNetworkReply::NoError) {
+        emit connectionError(reply->error());
        return;
    }

--- a/mkspecs/common/g++-win32.conf
+++ b/mkspecs/common/g++-win32.conf
@ -17,7 +17,7 @@ include(g++-base.conf)

 MAKEFILE_GENERATOR      = MINGW
 QMAKE_PLATFORM          = win32 mingw
-CONFIG                 += precompile_header
+CONFIG                 += debug_and_release debug_and_release_target precompile_header
 DEFINES                += UNICODE _UNICODE WIN32 MINGW_HAS_SECURE_API=1
 QMAKE_COMPILER_DEFINES += __GNUC__ _WIN32
 # can't add 'DEFINES += WIN64' and 'QMAKE_COMPILER_DEFINES += _WIN64' defines for
--- a/mkspecs/features/qt_build_config.prf
+++ b/mkspecs/features/qt_build_config.prf
@ -91,10 +91,13 @@ android|uikit|winrt: \
 # Prevent warnings about object files without any symbols
 macos: CONFIG += no_warn_empty_obj_files

+# Make sure the doc features are loaded last since they depend on other
+# features setting up things like includepaths to find everything.
+CONFIG = prepare_docs qt_docs_targets $$CONFIG
+
 CONFIG += \
    utf8_source \
    create_prl link_prl \
-    prepare_docs qt_docs_targets \
    no_private_qt_headers_warning QTDIR_build \
    qt_example_installs \
    # Qt modules get compiled without exceptions enabled by default.
--- a/mkspecs/features/qt_helper_lib.prf
+++ b/mkspecs/features/qt_helper_lib.prf
@ -60,7 +60,7 @@ win32|CONFIG(static, static|shared) {
        "QMAKE_DEFINES_$${ucmodule} = $$val_escape(MODULE_DEFINES)"
    android {
        MODULE_PRI_CONT += "QMAKE_LIBS_$${ucmodule} ="
-    } else: debug_and_release {
+    } else: qtConfig(debug_and_release): {
        win32: \
            MODULE_DEBUG_LIBS = $$DESTDIR/$$prefix$${TARGET}d.$$suffix
        else: darwin: \
--- a/src/corelib/itemmodels/qconcatenatetablesproxymodel.cpp
+++ b/src/corelib/itemmodels/qconcatenatetablesproxymodel.cpp
@ -447,6 +447,17 @@ QSize QConcatenateTablesProxyModel::span(const QModelIndex &index) const
    return sourceIndex.model()->span(sourceIndex);
 }

+/*!
+    Returns a list of models that were added as source models for this proxy model.
+
+    \since 5.15
+*/
+QList<QAbstractItemModel *> QConcatenateTablesProxyModel::sourceModels() const
+{
+    Q_D(const QConcatenateTablesProxyModel);
+    return d->m_models.toList();
+}
+
 /*!
    Adds a source model \a sourceModel, below all previously added source models.

--- a/src/corelib/itemmodels/qconcatenatetablesproxymodel.h
+++ b/src/corelib/itemmodels/qconcatenatetablesproxymodel.h
@ -56,6 +56,7 @@ public:
    explicit QConcatenateTablesProxyModel(QObject *parent = nullptr);
    ~QConcatenateTablesProxyModel();

+    QList<QAbstractItemModel *> sourceModels() const;
    Q_SCRIPTABLE void addSourceModel(QAbstractItemModel *sourceModel);
    Q_SCRIPTABLE void removeSourceModel(QAbstractItemModel *sourceModel);

--- a/src/corelib/kernel/qobjectdefs_impl.h
+++ b/src/corelib/kernel/qobjectdefs_impl.h
@ -285,11 +285,15 @@ namespace QtPrivate {
    {
    };

+    template <typename T>
+    using is_bool = std::is_same<bool, typename std::decay<T>::type>;
+
    template<typename From, typename To>
    struct AreArgumentsNarrowedBase<From, To, typename std::enable_if<sizeof(From) && sizeof(To)>::type>
        : std::integral_constant<bool,
              (std::is_floating_point<From>::value && std::is_integral<To>::value) ||
              (std::is_floating_point<From>::value && std::is_floating_point<To>::value && sizeof(From) > sizeof(To)) ||
+              ((std::is_pointer<From>::value || std::is_member_pointer<From>::value) && QtPrivate::is_bool<To>::value) ||
              ((std::is_integral<From>::value || std::is_enum<From>::value) && std::is_floating_point<To>::value) ||
              (std::is_integral<From>::value && std::is_integral<To>::value
               && (sizeof(From) > sizeof(To)
--- a/src/corelib/mimetypes/qmimeprovider_p.h
+++ b/src/corelib/mimetypes/qmimeprovider_p.h
@ -140,7 +140,7 @@ public:
    enum : bool { InternalDatabaseAvailable = false };
    QMimeXMLProvider(QMimeDatabasePrivate *db, InternalDatabaseEnum)
        : QMimeProviderBase(db, QString())
-    { Q_UNREACHABLE() };
+    { Q_UNREACHABLE(); };
 #endif
    QMimeXMLProvider(QMimeDatabasePrivate *db, const QString &directory);
    ~QMimeXMLProvider();
--- a/src/corelib/serialization/qxmlstream.cpp
+++ b/src/corelib/serialization/qxmlstream.cpp
@ -2041,6 +2041,42 @@ QStringRef QXmlStreamReader::dtdSystemId() const
   return QStringRef();
 }

+/*!
+  \since 5.15
+
+  Returns the maximum amount of characters a single entity is
+  allowed to expand into. If a single entity expands past the
+  given limit, the document is not considered well formed.
+
+  \sa setEntityExpansionLimit
+*/
+int QXmlStreamReader::entityExpansionLimit() const
+{
+    Q_D(const QXmlStreamReader);
+    return d->entityExpansionLimit;
+}
+
+/*!
+  \since 5.15
+
+  Sets the maximum amount of characters a single entity is
+  allowed to expand into to \a limit. If a single entity expands
+  past the given limit, the document is not considered well formed.
+
+  The limit is there to prevent DoS attacks when loading unknown
+  XML documents where recursive entity expansion could otherwise
+  exhaust all available memory.
+
+  The default value for this property is 4096 characters.
+
+  \sa entityExpansionLimit
+*/
+void QXmlStreamReader::setEntityExpansionLimit(int limit)
+{
+    Q_D(QXmlStreamReader);
+    d->entityExpansionLimit = limit;
+}
+
 /*!  If the tokenType() is \l StartElement, this function returns the
  element's namespace declarations. Otherwise an empty vector is
  returned.
--- a/src/corelib/serialization/qxmlstream.g
+++ b/src/corelib/serialization/qxmlstream.g
@ -285,9 +285,19 @@ public:
    QHash<QStringView, Entity> entityHash;
    QHash<QStringView, Entity> parameterEntityHash;
    QXmlStreamSimpleStack<Entity *>entityReferenceStack;
+    int entityExpansionLimit = 4096;
+    int entityLength = 0;
    inline bool referenceEntity(Entity &entity) {
        if (entity.isCurrentlyReferenced) {
-            raiseWellFormedError(QXmlStream::tr("Recursive entity detected."));
+            raiseWellFormedError(QXmlStream::tr("Self-referencing entity detected."));
+            return false;
+        }
+        // entityLength represents the amount of additional characters the
+        // entity expands into (can be negative for e.g. &amp;). It's used to
+        // avoid DoS attacks through recursive entity expansions
+        entityLength += entity.value.size() - entity.name.size() - 2;
+        if (entityLength > entityExpansionLimit) {
+            raiseWellFormedError(QXmlStream::tr("Entity expands to more characters than the entity expansion limit."));
            return false;
        }
        entity.isCurrentlyReferenced = true;
@ -838,6 +848,8 @@ entity_done ::= ENTITY_DONE;
 /.
        case $rule_number:
            entityReferenceStack.pop()->isCurrentlyReferenced = false;
+            if (entityReferenceStack.isEmpty())
+                entityLength = 0;
            clearSym();
        break;
 ./
--- a/src/corelib/serialization/qxmlstream.h
+++ b/src/corelib/serialization/qxmlstream.h
@ -426,6 +426,8 @@ public:
    QStringRef dtdPublicId() const;
    QStringRef dtdSystemId() const;

+    int entityExpansionLimit() const;
+    void setEntityExpansionLimit(int limit);

    enum Error {
        NoError,
--- a/src/corelib/serialization/qxmlstream_p.h
+++ b/src/corelib/serialization/qxmlstream_p.h
@ -774,9 +774,19 @@ public:
    QHash<QStringView, Entity> entityHash;
    QHash<QStringView, Entity> parameterEntityHash;
    QXmlStreamSimpleStack<Entity *>entityReferenceStack;
+    int entityExpansionLimit = 4096;
+    int entityLength = 0;
    inline bool referenceEntity(Entity &entity) {
        if (entity.isCurrentlyReferenced) {
-            raiseWellFormedError(QXmlStream::tr("Recursive entity detected."));
+            raiseWellFormedError(QXmlStream::tr("Self-referencing entity detected."));
+            return false;
+        }
+        // entityLength represents the amount of additional characters the
+        // entity expands into (can be negative for e.g. &amp;). It's used to
+        // avoid DoS attacks through recursive entity expansions
+        entityLength += entity.value.size() - entity.name.size() - 2;
+        if (entityLength > entityExpansionLimit) {
+            raiseWellFormedError(QXmlStream::tr("Entity expands to more characters than the entity expansion limit."));
            return false;
        }
        entity.isCurrentlyReferenced = true;
@ -1308,6 +1318,8 @@ bool QXmlStreamReaderPrivate::parse()

        case 10:
            entityReferenceStack.pop()->isCurrentlyReferenced = false;
+            if (entityReferenceStack.isEmpty())
+                entityLength = 0;
            clearSym();
        break;

--- a/src/corelib/thread/qrunnable.cpp
+++ b/src/corelib/thread/qrunnable.cpp
@ -115,29 +115,29 @@ QRunnable::~QRunnable()

 class FunctionRunnable : public QRunnable
 {
-    std::function<void()> m_functor;
+    std::function<void()> m_functionToRun;
 public:
-    FunctionRunnable(std::function<void()> functor) : m_functor(std::move(functor))
+    FunctionRunnable(std::function<void()> functionToRun) : m_functionToRun(std::move(functionToRun))
    {
    }
    void run() override
    {
-        m_functor();
+        m_functionToRun();
    }
 };

 /*!
    \since 5.15

-    Creates a QRunnable that calls \a fun in run().
+    Creates a QRunnable that calls \a functionToRun in run().

    Auto-deletion is enabled by default.

    \sa run(), autoDelete()
 */
-QRunnable *QRunnable::create(std::function<void()> fun)
+QRunnable *QRunnable::create(std::function<void()> functionToRun)
 {
-    return new FunctionRunnable(std::move(fun));
+    return new FunctionRunnable(std::move(functionToRun));
 }

 QT_END_NAMESPACE
--- a/src/corelib/thread/qrunnable.h
+++ b/src/corelib/thread/qrunnable.h
@ -60,7 +60,7 @@ public:

    QRunnable() : ref(0) { }
    virtual ~QRunnable();
-    static QRunnable *create(std::function<void()> fun);
+    static QRunnable *create(std::function<void()> functionToRun);

    bool autoDelete() const { return ref != -1; }
    void setAutoDelete(bool _autoDelete) { ref = _autoDelete ? 0 : -1; }
--- a/src/corelib/thread/qthreadpool.cpp
+++ b/src/corelib/thread/qthreadpool.cpp
@ -515,16 +515,16 @@ void QThreadPool::start(QRunnable *runnable, int priority)
    \overload
    \since 5.15

-    Reserves a thread and uses it to run \a fun, unless this thread will
+    Reserves a thread and uses it to run \a functionToRun, unless this thread will
    make the current thread count exceed maxThreadCount().  In that case,
-    \a fun is added to a run queue instead. The \a priority argument can
+    \a functionToRun is added to a run queue instead. The \a priority argument can
    be used to control the run queue's order of execution.
 */
-void QThreadPool::start(std::function<void()> fun, int priority)
+void QThreadPool::start(std::function<void()> functionToRun, int priority)
 {
-    if (!fun)
+    if (!functionToRun)
        return;
-    start(QRunnable::create(std::move(fun)), priority);
+    start(QRunnable::create(std::move(functionToRun)), priority);
 }

 /*!
@ -561,17 +561,17 @@ bool QThreadPool::tryStart(QRunnable *runnable)
 /*!
    \overload
    \since 5.15
-    Attempts to reserve a thread to run \a fun.
+    Attempts to reserve a thread to run \a functionToRun.

    If no threads are available at the time of calling, then this function
-    does nothing and returns \c false.  Otherwise, \a fun is run immediately
+    does nothing and returns \c false.  Otherwise, \a functionToRun is run immediately
    using one available thread and this function returns \c true.
 */
-bool QThreadPool::tryStart(std::function<void()> fun)
+bool QThreadPool::tryStart(std::function<void()> functionToRun)
 {
-    if (!fun)
+    if (!functionToRun)
        return false;
-    return tryStart(QRunnable::create(std::move(fun)));
+    return tryStart(QRunnable::create(std::move(functionToRun)));
 }

 /*! \property QThreadPool::expiryTimeout
--- a/src/corelib/thread/qthreadpool.h
+++ b/src/corelib/thread/qthreadpool.h
@ -72,8 +72,8 @@ public:
    void start(QRunnable *runnable, int priority = 0);
    bool tryStart(QRunnable *runnable);

-    void start(std::function<void()> fun, int priority = 0);
-    bool tryStart(std::function<void()> fun);
+    void start(std::function<void()> functionToRun, int priority = 0);
+    bool tryStart(std::function<void()> functionToRun);

    int expiryTimeout() const;
    void setExpiryTimeout(int expiryTimeout);
--- a/src/corelib/time/qdatetimeparser.cpp
+++ b/src/corelib/time/qdatetimeparser.cpp
@ -1539,6 +1539,14 @@ QDateTimeParser::parse(QString input, int position, const QDateTime &defaultValu
    text = scan.input = input;
    // Set spec *after* all checking, so validity is a property of the string:
    scan.value = scan.value.toTimeSpec(spec);
+
+    /*
+        However, even with a valid string we might have ended up with an invalid datetime:
+        the non-existent hour during dst changes, for instance.
+    */
+    if (!scan.value.isValid() && scan.state == Acceptable)
+        scan.state = Intermediate;
+
    return scan;
 }

--- a/src/corelib/tools/qhash.h
+++ b/src/corelib/tools/qhash.h
@ -324,7 +324,7 @@ public:
        QHashData::Node *i;

    public:
-#if QT_DEPRECATED_SINCE(5, 15)
+#if QT_DEPRECATED_WARNINGS_SINCE < QT_VERSION_CHECK(5, 15, 0)
        typedef std::bidirectional_iterator_tag iterator_category;
 #else
        typedef std::forward_iterator_tag iterator_category;
@ -354,23 +354,23 @@ public:
            return r;
        }
 #if QT_DEPRECATED_SINCE(5, 15)
-        inline QT_DEPRECATED iterator &operator--()
+        inline QT_DEPRECATED_VERSION_5_15 iterator &operator--()
        {
            i = QHashData::previousNode(i);
            return *this;
        }
-        inline QT_DEPRECATED iterator operator--(int)
+        inline QT_DEPRECATED_VERSION_5_15 iterator operator--(int)
        {
            iterator r = *this;
            i = QHashData::previousNode(i);
            return r;
        }
-        inline QT_DEPRECATED iterator operator+(int j) const
+        inline QT_DEPRECATED_VERSION_5_15 iterator operator+(int j) const
        { iterator r = *this; if (j > 0) while (j--) ++r; else while (j++) --r; return r; }
-        inline QT_DEPRECATED iterator operator-(int j) const { return operator+(-j); }
-        inline QT_DEPRECATED iterator &operator+=(int j) { return *this = *this + j; }
-        inline QT_DEPRECATED iterator &operator-=(int j) { return *this = *this - j; }
-        friend inline QT_DEPRECATED iterator operator+(int j, iterator k) { return k + j; }
+        inline QT_DEPRECATED_VERSION_5_15 iterator operator-(int j) const { return operator+(-j); }
+        inline QT_DEPRECATED_VERSION_5_15 iterator &operator+=(int j) { return *this = *this + j; }
+        inline QT_DEPRECATED_VERSION_5_15 iterator &operator-=(int j) { return *this = *this - j; }
+        friend inline QT_DEPRECATED_VERSION_5_15 iterator operator+(int j, iterator k) { return k + j; }
 #endif

        inline bool operator==(const const_iterator &o) const { return i == o.i; }
@ -387,7 +387,7 @@ public:
        QHashData::Node *i;

    public:
-#if QT_DEPRECATED_SINCE(5, 15)
+#if QT_DEPRECATED_WARNINGS_SINCE < QT_VERSION_CHECK(5, 15, 0)
        typedef std::bidirectional_iterator_tag iterator_category;
 #else
        typedef std::forward_iterator_tag iterator_category;
@ -420,23 +420,23 @@ public:
            return r;
        }
 #if QT_DEPRECATED_SINCE(5, 15)
-        inline QT_DEPRECATED const_iterator &operator--()
+        inline QT_DEPRECATED_VERSION_5_15 const_iterator &operator--()
        {
            i = QHashData::previousNode(i);
            return *this;
        }
-        inline QT_DEPRECATED const_iterator operator--(int)
+        inline QT_DEPRECATED_VERSION_5_15 const_iterator operator--(int)
        {
            const_iterator r = *this;
            i = QHashData::previousNode(i);
            return r;
        }
-        inline QT_DEPRECATED const_iterator operator+(int j) const
+        inline QT_DEPRECATED_VERSION_5_15 const_iterator operator+(int j) const
        { const_iterator r = *this; if (j > 0) while (j--) ++r; else while (j++) --r; return r; }
-        inline QT_DEPRECATED const_iterator operator-(int j) const { return operator+(-j); }
-        inline QT_DEPRECATED const_iterator &operator+=(int j) { return *this = *this + j; }
-        inline QT_DEPRECATED const_iterator &operator-=(int j) { return *this = *this - j; }
-        friend inline QT_DEPRECATED const_iterator operator+(int j, const_iterator k)
+        inline QT_DEPRECATED_VERSION_5_15 const_iterator operator-(int j) const { return operator+(-j); }
+        inline QT_DEPRECATED_VERSION_5_15 const_iterator &operator+=(int j) { return *this = *this + j; }
+        inline QT_DEPRECATED_VERSION_5_15 const_iterator &operator-=(int j) { return *this = *this - j; }
+        friend inline QT_DEPRECATED_VERSION_5_15 const_iterator operator+(int j, const_iterator k)
        {
            return k + j;
        }
@ -466,12 +466,12 @@ public:
        inline key_iterator &operator++() { ++i; return *this; }
        inline key_iterator operator++(int) { return key_iterator(i++);}
 #if QT_DEPRECATED_SINCE(5, 15)
-        inline QT_DEPRECATED key_iterator &operator--()
+        inline QT_DEPRECATED_VERSION_5_15 key_iterator &operator--()
        {
            --i;
            return *this;
        }
-        inline QT_DEPRECATED key_iterator operator--(int) { return key_iterator(i--); }
+        inline QT_DEPRECATED_VERSION_5_15 key_iterator operator--(int) { return key_iterator(i--); }
 #endif
        const_iterator base() const { return i; }
    };
@ -1302,18 +1302,18 @@ public:
        return false;
    }
 #if QT_DEPRECATED_SINCE(5, 15)
-    inline QT_DEPRECATED bool hasPrevious() const { return i != c.constBegin(); }
-    inline QT_DEPRECATED Item previous()
+    inline QT_DEPRECATED_VERSION_5_15 bool hasPrevious() const { return i != c.constBegin(); }
+    inline QT_DEPRECATED_VERSION_5_15 Item previous()
    {
        n = --i;
        return n;
    }
-    inline QT_DEPRECATED Item peekPrevious() const
+    inline QT_DEPRECATED_VERSION_5_15 Item peekPrevious() const
    {
        const_iterator p = i;
        return --p;
    }
-    inline bool QT_DEPRECATED findPrevious(const T &t)
+    inline bool QT_DEPRECATED_VERSION_5_15 findPrevious(const T &t)
    {
        while (i != c.constBegin())
            if (*(n = --i) == t)
@ -1399,18 +1399,18 @@ public:
        return false;
    }
 #if QT_DEPRECATED_SINCE(5, 15)
-    inline QT_DEPRECATED bool hasPrevious() const { return const_iterator(i) != c->constBegin(); }
-    inline QT_DEPRECATED Item previous()
+    inline QT_DEPRECATED_VERSION_5_15 bool hasPrevious() const { return const_iterator(i) != c->constBegin(); }
+    inline QT_DEPRECATED_VERSION_5_15 Item previous()
    {
        n = --i;
        return n;
    }
-    inline QT_DEPRECATED Item peekPrevious() const
+    inline QT_DEPRECATED_VERSION_5_15 Item peekPrevious() const
    {
        iterator p = i;
        return --p;
    }
-    inline QT_DEPRECATED bool findPrevious(const T &t)
+    inline QT_DEPRECATED_VERSION_5_15 bool findPrevious(const T &t)
    {
        while (const_iterator(i) != c->constBegin())
            if (*(n = --i) == t)
--- a/src/gui/kernel/qscreen.cpp
+++ b/src/gui/kernel/qscreen.cpp
@ -710,7 +710,7 @@ void QScreenPrivate::updatePrimaryOrientation()

    \since 5.15
 */
-QScreen *QScreen::virtualSiblingAt(const QPoint &point)
+QScreen *QScreen::virtualSiblingAt(QPoint point)
 {
    const auto &siblings = virtualSiblings();
    for (QScreen *sibling : siblings) {
--- a/src/gui/kernel/qscreen.h
+++ b/src/gui/kernel/qscreen.h
@ -125,7 +125,7 @@ public:
    QRect availableGeometry() const;

    QList<QScreen *> virtualSiblings() const;
-    QScreen *virtualSiblingAt(const QPoint &point);
+    QScreen *virtualSiblingAt(QPoint point);

    QSize virtualSize() const;
    QRect virtualGeometry() const;
--- a/src/gui/text/qfontengine.cpp
+++ b/src/gui/text/qfontengine.cpp
@ -663,6 +663,9 @@ glyph_metrics_t QFontEngine::tightBoundingBox(const QGlyphLayout &glyphs)
    QFixed ymax = 0;
    QFixed xmax = 0;
    for (int i = 0; i < glyphs.numGlyphs; i++) {
+        // If shaping has found this should be ignored, ignore it.
+        if (!glyphs.advances[i] || glyphs.attributes[i].dontPrint)
+            continue;
        glyph_metrics_t bb = boundingBox(glyphs.glyphs[i]);
        QFixed x = overall.xoff + glyphs.offsets[i].x + bb.x;
        QFixed y = overall.yoff + glyphs.offsets[i].y + bb.y;
--- a/src/gui/text/qtextengine.cpp
+++ b/src/gui/text/qtextengine.cpp
@ -712,9 +712,8 @@ struct QBidiAlgorithm {
                        analysis[pos].bidiDirection = QChar::DirEN;
                        ++it;
                    }
-                } else {
-                    lastETPosition.clear();
                }
+                lastETPosition.clear();
            }
            last = current;
            lastPos = pos;
--- a/src/network/access/qftp.cpp
+++ b/src/network/access/qftp.cpp
@ -324,7 +324,7 @@ void QFtpDTP::connectToHost(const QString & host, quint16 port)
    socket->setObjectName(QLatin1String("QFtpDTP Passive state socket"));
    connect(socket, SIGNAL(connected()), SLOT(socketConnected()));
    connect(socket, SIGNAL(readyRead()), SLOT(socketReadyRead()));
-    connect(socket, SIGNAL(error(QAbstractSocket::SocketError)), SLOT(socketError(QAbstractSocket::SocketError)));
+    connect(socket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)), SLOT(socketError(QAbstractSocket::SocketError)));
    connect(socket, SIGNAL(disconnected()), SLOT(socketConnectionClosed()));
    connect(socket, SIGNAL(bytesWritten(qint64)), SLOT(socketBytesWritten(qint64)));

@ -769,7 +769,7 @@ void QFtpDTP::setupSocket()
    socket->setObjectName(QLatin1String("QFtpDTP Active state socket"));
    connect(socket, SIGNAL(connected()), SLOT(socketConnected()));
    connect(socket, SIGNAL(readyRead()), SLOT(socketReadyRead()));
-    connect(socket, SIGNAL(error(QAbstractSocket::SocketError)), SLOT(socketError(QAbstractSocket::SocketError)));
+    connect(socket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)), SLOT(socketError(QAbstractSocket::SocketError)));
    connect(socket, SIGNAL(disconnected()), SLOT(socketConnectionClosed()));
    connect(socket, SIGNAL(bytesWritten(qint64)), SLOT(socketBytesWritten(qint64)));

@ -807,7 +807,7 @@ QFtpPI::QFtpPI(QObject *parent) :
            SLOT(connectionClosed()));
    connect(&commandSocket, SIGNAL(readyRead()),
            SLOT(readyRead()));
-    connect(&commandSocket, SIGNAL(error(QAbstractSocket::SocketError)),
+    connect(&commandSocket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)),
            SLOT(error(QAbstractSocket::SocketError)));

    connect(&dtp, SIGNAL(connectState(int)),
--- a/src/network/access/qhttpnetworkconnectionchannel.cpp
+++ b/src/network/access/qhttpnetworkconnectionchannel.cpp
@ -156,7 +156,7 @@ void QHttpNetworkConnectionChannel::init()
    QObject::connect(socket, SIGNAL(disconnected()),
                     this, SLOT(_q_disconnected()),
                     Qt::DirectConnection);
-    QObject::connect(socket, SIGNAL(error(QAbstractSocket::SocketError)),
+    QObject::connect(socket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)),
                     this, SLOT(_q_error(QAbstractSocket::SocketError)),
                     Qt::DirectConnection);

--- a/src/network/access/qhttpprotocolhandler.cpp
+++ b/src/network/access/qhttpprotocolhandler.cpp
@ -233,7 +233,7 @@ void QHttpProtocolHandler::_q_readyRead()
        char c;
        qint64  ret = m_socket->peek(&c, 1);
        if (ret < 0) {
-            m_channel->_q_error(m_socket->socketError());
+            m_channel->_q_error(m_socket->error());
            // We still need to handle the reply so it emits its signals etc.
            if (m_reply)
                _q_receiveReply();
--- a/src/network/access/qnetworkaccessdebugpipebackend.cpp
+++ b/src/network/access/qnetworkaccessdebugpipebackend.cpp
@ -98,7 +98,7 @@ void QNetworkAccessDebugPipeBackend::open()

    // socket ready read -> we can push from socket to downstream
    connect(&socket, SIGNAL(readyRead()), SLOT(socketReadyRead()));
-    connect(&socket, SIGNAL(error(QAbstractSocket::SocketError)), SLOT(socketError()));
+    connect(&socket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)), SLOT(socketError()));
    connect(&socket, SIGNAL(disconnected()), SLOT(socketDisconnected()));
    connect(&socket, SIGNAL(connected()), SLOT(socketConnected()));
    // socket bytes written -> we can push more from upstream to socket
@ -242,9 +242,9 @@ void QNetworkAccessDebugPipeBackend::closeDownstreamChannel()

 void QNetworkAccessDebugPipeBackend::socketError()
 {
-    qWarning("QNetworkAccessDebugPipeBackend::socketError() %d",socket.socketError());
+    qWarning("QNetworkAccessDebugPipeBackend::socketError() %d",socket.error());
    QNetworkReply::NetworkError code;
-    switch (socket.socketError()) {
+    switch (socket.error()) {
    case QAbstractSocket::RemoteHostClosedError:
        return;                 // socketDisconnected will be called

--- a/src/network/access/qnetworkaccessmanager.cpp
+++ b/src/network/access/qnetworkaccessmanager.cpp
@ -1726,7 +1726,7 @@ int QNetworkAccessManager::transferTimeout() const
    Transfers are aborted if no bytes are transferred before
    the timeout expires. Zero means no timer is set. If no
    argument is provided, the timeout is
-    QNetworkRequest::TransferTimeoutPreset. If this function
+    QNetworkRequest::DefaultTransferTimeoutConstant. If this function
    is not called, the timeout is disabled and has the
    value zero. The request-specific non-zero timeouts set for
    the requests that are executed override this value. This means
--- a/src/network/access/qnetworkreply.cpp
+++ b/src/network/access/qnetworkreply.cpp
@ -554,32 +554,13 @@ QNetworkAccessManager::Operation QNetworkReply::operation() const
    return d_func()->operation;
 }

-#if QT_DEPRECATED_SINCE(5, 15)
 /*!
-    \deprecated
-
-    Use networkError() instead.
-
-    Returns the error that was found during the processing of this
-    request. If no error was found, returns NoError.
-
-    \sa setError(), networkError()
-*/
-QNetworkReply::NetworkError QNetworkReply::error() const
-{
-    return networkError();
-}
-#endif // QT_DEPRECATED_SINCE(5, 15)
-
-/*!
-    \since 5.15
-
    Returns the error that was found during the processing of this
    request. If no error was found, returns NoError.

    \sa setError()
 */
-QNetworkReply::NetworkError QNetworkReply::networkError() const
+QNetworkReply::NetworkError QNetworkReply::error() const
 {
    return d_func()->errorCode;
 }
@ -877,7 +858,7 @@ void QNetworkReply::setRequest(const QNetworkRequest &request)
    Calling setError() does not emit the error(QNetworkReply::NetworkError)
    signal.

-    \sa error(), errorString(), networkError()
+    \sa error(), errorString()
 */
 void QNetworkReply::setError(NetworkError errorCode, const QString &errorString)
 {
--- a/src/network/access/qnetworkreply.h
+++ b/src/network/access/qnetworkreply.h
@ -124,12 +124,7 @@ public:
    QNetworkAccessManager *manager() const;
    QNetworkAccessManager::Operation operation() const;
    QNetworkRequest request() const;
-
-#if QT_DEPRECATED_SINCE(5, 15)
-    QT_DEPRECATED_X("Use networkError()") NetworkError error() const;
-#endif // QT_DEPRECATED_SINCE(5, 15)
-    NetworkError networkError() const;
-
+    NetworkError error() const;
    bool isFinished() const;
    bool isRunning() const;
    QUrl url() const;
--- a/src/network/access/qnetworkrequest.cpp
+++ b/src/network/access/qnetworkrequest.cpp
@ -931,7 +931,7 @@ int QNetworkRequest::transferTimeout() const
    Transfers are aborted if no bytes are transferred before
    the timeout expires. Zero means no timer is set. If no
    argument is provided, the timeout is
-    QNetworkRequest::TransferTimeoutPreset. If this function
+    QNetworkRequest::DefaultTransferTimeoutConstant. If this function
    is not called, the timeout is disabled and has the
    value zero.

--- a/src/network/socket/qabstractsocket.cpp
+++ b/src/network/socket/qabstractsocket.cpp
@ -84,7 +84,7 @@
    HostLookupState. If the host is found, QAbstractSocket enters
    ConnectingState and emits the hostFound() signal. When the
    connection has been established, it enters ConnectedState and
-    emits connected(). If an error occurs at any stage, error() is
+    emits connected(). If an error occurs at any stage, errorOccurred() is
    emitted. Whenever the state changes, stateChanged() is emitted.
    For convenience, isValid() returns \c true if the socket is ready for
    reading and writing, but note that the socket's state must be
@ -113,7 +113,7 @@
    QAbstractSocket::UnconnectedState, and emits disconnected(). If you want
    to abort a connection immediately, discarding all pending data, call
    abort() instead. If the remote host closes the connection,
-    QAbstractSocket will emit error(QAbstractSocket::RemoteHostClosedError),
+    QAbstractSocket will emit errorOccurred(QAbstractSocket::RemoteHostClosedError),
    during which the socket state will still be ConnectedState, and then the
    disconnected() signal will be emitted.

@ -203,6 +203,14 @@

 /*!
    \fn void QAbstractSocket::error(QAbstractSocket::SocketError socketError)
+    \obsolete
+
+    Use errorOccurred() instead.
+*/
+
+/*!
+    \fn void QAbstractSocket::errorOccurred(QAbstractSocket::SocketError socketError)
+    \since 5.15

    This signal is emitted after an error occurred. The \a socketError
    parameter describes the type of error that occurred.
@ -215,7 +223,7 @@
    connections, you will have to register it with Q_DECLARE_METATYPE() and
    qRegisterMetaType().

-    \sa socketError(), errorString(), {Creating Custom Qt Types}
+    \sa error(), errorString(), {Creating Custom Qt Types}
 */

 /*!
@ -329,7 +337,8 @@
           is non-blocking).

    \value UnknownSocketError An unidentified error occurred.
-    \sa QAbstractSocket::socketError()
+    \sa QAbstractSocket::error()
+    \sa QAbstractSocket::errorOccurred()
 */

 /*!
@ -988,7 +997,7 @@ void QAbstractSocketPrivate::startConnectingByName(const QString &host)
    }

    state = QAbstractSocket::UnconnectedState;
-    emit q->error(socketError);
+    emit q->errorOccurred(socketError);
    emit q->stateChanged(state);
 }

@ -1047,7 +1056,7 @@ void QAbstractSocketPrivate::_q_startConnecting(const QHostInfo &hostInfo)
        state = QAbstractSocket::UnconnectedState;
        setError(QAbstractSocket::HostNotFoundError, QAbstractSocket::tr("Host not found"));
        emit q->stateChanged(state);
-        emit q->error(QAbstractSocket::HostNotFoundError);
+        emit q->errorOccurred(QAbstractSocket::HostNotFoundError);
        return;
    }

@ -1070,8 +1079,8 @@ void QAbstractSocketPrivate::_q_startConnecting(const QHostInfo &hostInfo)
    _q_testConnection(), this function takes the first address of the
    pending addresses list and tries to connect to it. If the
    connection succeeds, QAbstractSocket will emit
-    connected(). Otherwise, error(ConnectionRefusedError) or
-    error(SocketTimeoutError) is emitted.
+    connected(). Otherwise, errorOccurred(ConnectionRefusedError) or
+    errorOccurred(SocketTimeoutError) is emitted.
 */
 void QAbstractSocketPrivate::_q_connectToNextAddress()
 {
@ -1101,7 +1110,7 @@ void QAbstractSocketPrivate::_q_connectToNextAddress()
 //                q->setErrorString(QAbstractSocket::tr("Connection refused"));
            }
            emit q->stateChanged(state);
-            emit q->error(socketError);
+            emit q->errorOccurred(socketError);
            return;
        }

@ -1223,7 +1232,7 @@ void QAbstractSocketPrivate::_q_abortConnectionAttempt()
        setError(QAbstractSocket::SocketTimeoutError,
                 QAbstractSocket::tr("Connection timed out"));
        emit q->stateChanged(state);
-        emit q->error(socketError);
+        emit q->errorOccurred(socketError);
    } else {
        _q_connectToNextAddress();
    }
@ -1430,14 +1439,14 @@ void QAbstractSocketPrivate::setError(QAbstractSocket::SocketError errorCode,
    \internal

    Sets the socket error state to \c errorCode and \a errorString,
-    and emits the QAbstractSocket::error() signal.
+    and emits the QAbstractSocket::errorOccurred() signal.
 */
 void QAbstractSocketPrivate::setErrorAndEmit(QAbstractSocket::SocketError errorCode,
                                             const QString &errorString)
 {
    Q_Q(QAbstractSocket);
    setError(errorCode, errorString);
-    emit q->error(errorCode);
+    emit q->errorOccurred(errorCode);
 }

 /*! \internal
@ -1456,6 +1465,9 @@ QAbstractSocket::QAbstractSocket(SocketType socketType,
           : socketType == SctpSocket ? "Sctp" : "Unknown", &dd, parent);
 #endif
    d->socketType = socketType;
+
+    // Support the deprecated error() signal:
+    connect(this, &QAbstractSocket::errorOccurred, this, QOverload<QAbstractSocket::SocketError>::of(&QAbstractSocket::error));
 }

 /*!
@ -1654,7 +1666,7 @@ bool QAbstractSocket::isValid() const
    established, QAbstractSocket enters ConnectedState and
    emits connected().

-    At any point, the socket can emit error() to signal that an error
+    At any point, the socket can emit errorOccurred() to signal that an error
    occurred.

    \a hostName may be an IP address in string form (e.g.,
@ -2092,7 +2104,7 @@ QVariant QAbstractSocket::socketOption(QAbstractSocket::SocketOption option)
    Waits until the socket is connected, up to \a msecs
    milliseconds. If the connection has been established, this
    function returns \c true; otherwise it returns \c false. In the case
-    where it returns \c false, you can call socketError() to determine
+    where it returns \c false, you can call error() to determine
    the cause of the error.

    The following example waits up to one second for a connection
@ -2864,7 +2876,7 @@ void QAbstractSocket::setReadBufferSize(qint64 size)
 /*!
    Returns the state of the socket.

-    \sa socketError()
+    \sa error()
 */
 QAbstractSocket::SocketState QAbstractSocket::state() const
 {
@ -2891,35 +2903,16 @@ QAbstractSocket::SocketType QAbstractSocket::socketType() const
    return d_func()->socketType;
 }

-#if QT_DEPRECATED_SINCE(5, 15)
 /*!
-    \deprecated
-
-    Use socketError() instead.
-
-    Returns the type of error that last occurred.
-
-    \sa state(), errorString(), socketError()
-*/
-QAbstractSocket::SocketError QAbstractSocket::error() const
-{
-    return socketError();
-}
-#endif //  QT_DEPRECATED_SINCE(5, 15)
-
-/*!
-    \since 5.15
-
    Returns the type of error that last occurred.

    \sa state(), errorString()
 */
-QAbstractSocket::SocketError QAbstractSocket::socketError() const
+QAbstractSocket::SocketError QAbstractSocket::error() const
 {
    return d_func()->socketError;
 }

-
 /*!
    Sets the type of error that last occurred to \a socketError.

--- a/src/network/socket/qabstractsocket.h
+++ b/src/network/socket/qabstractsocket.h
@ -180,12 +180,7 @@ public:

    SocketType socketType() const;
    SocketState state() const;
-
-#if QT_DEPRECATED_SINCE(5, 15)
-    QT_DEPRECATED_X("Use socketError()") SocketError error() const;
-#endif // QT_DEPRECATED_SINCE(5, 15)
-
-    SocketError socketError() const;
+    SocketError error() const;

    // from QIODevice
    void close() override;
@ -211,7 +206,11 @@ Q_SIGNALS:
    void connected();
    void disconnected();
    void stateChanged(QAbstractSocket::SocketState);
+#if QT_DEPRECATED_SINCE(5,15)
+    QT_DEPRECATED_X("Use QAbstractSocket::errorOccurred(QAbstractSocket::SocketError) instead")
    void error(QAbstractSocket::SocketError);
+#endif
+    void errorOccurred(QAbstractSocket::SocketError);
 #ifndef QT_NO_NETWORKPROXY
    void proxyAuthenticationRequired(const QNetworkProxy &proxy, QAuthenticator *authenticator);
 #endif
--- a/src/network/socket/qhttpsocketengine.cpp
+++ b/src/network/socket/qhttpsocketengine.cpp
@ -93,7 +93,7 @@ bool QHttpSocketEngine::initialize(QAbstractSocket::SocketType type, QAbstractSo
    connect(d->socket, SIGNAL(bytesWritten(qint64)),
            this, SLOT(slotSocketBytesWritten()),
            Qt::DirectConnection);
-    connect(d->socket, SIGNAL(error(QAbstractSocket::SocketError)),
+    connect(d->socket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)),
            this, SLOT(slotSocketError(QAbstractSocket::SocketError)),
            Qt::DirectConnection);
    connect(d->socket, SIGNAL(stateChanged(QAbstractSocket::SocketState)),
@ -370,8 +370,8 @@ bool QHttpSocketEngine::waitForRead(int msecs, bool *timedOut)
        if (!d->socket->waitForReadyRead(qt_subtract_from_timeout(msecs, stopWatch.elapsed()))) {
            if (d->socket->state() == QAbstractSocket::UnconnectedState)
                return true;
-            setError(d->socket->socketError(), d->socket->errorString());
-            if (timedOut && d->socket->socketError() == QAbstractSocket::SocketTimeoutError)
+            setError(d->socket->error(), d->socket->errorString());
+            if (timedOut && d->socket->error() == QAbstractSocket::SocketTimeoutError)
                *timedOut = true;
            return false;
        }
@ -385,8 +385,8 @@ bool QHttpSocketEngine::waitForRead(int msecs, bool *timedOut)

    // Report any error that may occur.
    if (d->state != Connected) {
-        setError(d->socket->socketError(), d->socket->errorString());
-        if (timedOut && d->socket->socketError() == QAbstractSocket::SocketTimeoutError)
+        setError(d->socket->error(), d->socket->errorString());
+        if (timedOut && d->socket->error() == QAbstractSocket::SocketTimeoutError)
            *timedOut = true;
        return false;
    }
@ -401,7 +401,7 @@ bool QHttpSocketEngine::waitForWrite(int msecs, bool *timedOut)
    if (d->state == Connected) {
        if (d->socket->bytesToWrite()) {
            if (!d->socket->waitForBytesWritten(msecs)) {
-                if (d->socket->socketError() == QAbstractSocket::SocketTimeoutError && timedOut)
+                if (d->socket->error() == QAbstractSocket::SocketTimeoutError && timedOut)
                    *timedOut = true;
                return false;
            }
@ -421,7 +421,8 @@ bool QHttpSocketEngine::waitForWrite(int msecs, bool *timedOut)

    // Report any error that may occur.
    if (d->state != Connected) {
-        if (timedOut && d->socket->socketError() == QAbstractSocket::SocketTimeoutError)
+//        setError(d->socket->error(), d->socket->errorString());
+        if (timedOut && d->socket->error() == QAbstractSocket::SocketTimeoutError)
            *timedOut = true;
    }

--- a/src/network/socket/qlocalsocket.h
+++ b/src/network/socket/qlocalsocket.h
@ -132,14 +132,14 @@ private:
    Q_DISABLE_COPY(QLocalSocket)
 #if defined(QT_LOCALSOCKET_TCP)
    Q_PRIVATE_SLOT(d_func(), void _q_stateChanged(QAbstractSocket::SocketState))
-    Q_PRIVATE_SLOT(d_func(), void _q_error(QAbstractSocket::SocketError))
+    Q_PRIVATE_SLOT(d_func(), void _q_errorOccurred(QAbstractSocket::SocketError))
 #elif defined(Q_OS_WIN)
    Q_PRIVATE_SLOT(d_func(), void _q_canWrite())
    Q_PRIVATE_SLOT(d_func(), void _q_pipeClosed())
    Q_PRIVATE_SLOT(d_func(), void _q_winError(ulong, const QString &))
 #else
    Q_PRIVATE_SLOT(d_func(), void _q_stateChanged(QAbstractSocket::SocketState))
-    Q_PRIVATE_SLOT(d_func(), void _q_error(QAbstractSocket::SocketError))
+    Q_PRIVATE_SLOT(d_func(), void _q_errorOccurred(QAbstractSocket::SocketError))
    Q_PRIVATE_SLOT(d_func(), void _q_connectToSocket())
    Q_PRIVATE_SLOT(d_func(), void _q_abortConnectionAttempt())
 #endif
--- a/src/network/socket/qlocalsocket_p.h
+++ b/src/network/socket/qlocalsocket_p.h
@ -127,7 +127,7 @@ public:
    QString generateErrorString(QLocalSocket::LocalSocketError, const QString &function) const;
    void setErrorAndEmit(QLocalSocket::LocalSocketError, const QString &function);
    void _q_stateChanged(QAbstractSocket::SocketState newState);
-    void _q_error(QAbstractSocket::SocketError newError);
+    void _q_errorOccurred(QAbstractSocket::SocketError newError);
 #elif defined(Q_OS_WIN)
    ~QLocalSocketPrivate();
    void destroyPipeHandles();
@ -144,7 +144,7 @@ public:
    QString generateErrorString(QLocalSocket::LocalSocketError, const QString &function) const;
    void setErrorAndEmit(QLocalSocket::LocalSocketError, const QString &function);
    void _q_stateChanged(QAbstractSocket::SocketState newState);
-    void _q_error(QAbstractSocket::SocketError newError);
+    void _q_errorOccurred(QAbstractSocket::SocketError newError);
    void _q_connectToSocket();
    void _q_abortConnectionAttempt();
    void cancelDelayedConnect();
--- a/src/network/socket/qlocalsocket_tcp.cpp
+++ b/src/network/socket/qlocalsocket_tcp.cpp
@ -77,8 +77,8 @@ void QLocalSocketPrivate::setSocket(QLocalUnixSocket* socket)
    q->connect(tcpSocket, SIGNAL(disconnected()), q, SIGNAL(disconnected()));
    q->connect(tcpSocket, SIGNAL(stateChanged(QAbstractSocket::SocketState)),
               q, SLOT(_q_stateChanged(QAbstractSocket::SocketState)));
-    q->connect(tcpSocket, SIGNAL(error(QAbstractSocket::SocketError)),
-               q, SLOT(_q_error(QAbstractSocket::SocketError)));
+    q->connect(tcpSocket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)),
+               q, SLOT(_q_errorOccurred(QAbstractSocket::SocketError)));
    q->connect(tcpSocket, SIGNAL(readChannelFinished()), q, SIGNAL(readChannelFinished()));
    tcpSocket->setParent(q);
 }
@ -88,7 +88,7 @@ qint64 QLocalSocketPrivate::skip(qint64 maxSize)
    return tcpSocket->skip(maxSize);
 }

-void QLocalSocketPrivate::_q_error(QAbstractSocket::SocketError socketError)
+void QLocalSocketPrivate::_q_errorOccurred(QAbstractSocket::SocketError socketError)
 {
    Q_Q(QLocalSocket);
    QString function = QLatin1String("QLocalSocket");
--- a/src/network/socket/qlocalsocket_unix.cpp
+++ b/src/network/socket/qlocalsocket_unix.cpp
@ -81,8 +81,8 @@ void QLocalSocketPrivate::init()
    q->connect(&unixSocket, SIGNAL(disconnected()), q, SIGNAL(disconnected()));
    q->connect(&unixSocket, SIGNAL(stateChanged(QAbstractSocket::SocketState)),
               q, SLOT(_q_stateChanged(QAbstractSocket::SocketState)));
-    q->connect(&unixSocket, SIGNAL(error(QAbstractSocket::SocketError)),
-               q, SLOT(_q_error(QAbstractSocket::SocketError)));
+    q->connect(&unixSocket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)),
+               q, SLOT(_q_errorOccurred(QAbstractSocket::SocketError)));
    q->connect(&unixSocket, SIGNAL(readChannelFinished()), q, SIGNAL(readChannelFinished()));
    unixSocket.setParent(q);
 }
@ -92,7 +92,7 @@ qint64 QLocalSocketPrivate::skip(qint64 maxSize)
    return unixSocket.skip(maxSize);
 }

-void QLocalSocketPrivate::_q_error(QAbstractSocket::SocketError socketError)
+void QLocalSocketPrivate::_q_errorOccurred(QAbstractSocket::SocketError socketError)
 {
    Q_Q(QLocalSocket);
    QString function = QLatin1String("QLocalSocket");
@ -464,7 +464,7 @@ void QLocalSocket::disconnectFromServer()
 QLocalSocket::LocalSocketError QLocalSocket::error() const
 {
    Q_D(const QLocalSocket);
-    switch (d->unixSocket.socketError()) {
+    switch (d->unixSocket.error()) {
    case QAbstractSocket::ConnectionRefusedError:
        return QLocalSocket::ConnectionRefusedError;
    case QAbstractSocket::RemoteHostClosedError:
--- a/src/network/socket/qsocks5socketengine.cpp
+++ b/src/network/socket/qsocks5socketengine.cpp
@ -559,8 +559,8 @@ void QSocks5SocketEnginePrivate::initialize(Socks5Mode socks5Mode)
                     Qt::DirectConnection);
    QObject::connect(data->controlSocket, SIGNAL(bytesWritten(qint64)), q, SLOT(_q_controlSocketBytesWritten()),
                     Qt::DirectConnection);
-    QObject::connect(data->controlSocket, SIGNAL(error(QAbstractSocket::SocketError)),
-                     q, SLOT(_q_controlSocketError(QAbstractSocket::SocketError)),
+    QObject::connect(data->controlSocket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)),
+                     q, SLOT(_q_controlSocketErrorOccurred(QAbstractSocket::SocketError)),
                     Qt::DirectConnection);
    QObject::connect(data->controlSocket, SIGNAL(disconnected()), q, SLOT(_q_controlSocketDisconnected()),
                     Qt::DirectConnection);
@ -594,7 +594,7 @@ void QSocks5SocketEnginePrivate::setErrorState(Socks5State state, const QString

    case ConnectError:
    case ControlSocketError: {
-        QAbstractSocket::SocketError controlSocketError = data->controlSocket->socketError();
+        QAbstractSocket::SocketError controlSocketError = data->controlSocket->error();
        if (socks5State != Connected) {
            switch (controlSocketError) {
            case QAbstractSocket::ConnectionRefusedError:
@ -918,7 +918,7 @@ void QSocks5SocketEnginePrivate::_q_emitPendingReadNotification()
            return;
        // check if there needs to be a new zero read notification
        if (data && data->controlSocket->state() == QAbstractSocket::UnconnectedState
-                && data->controlSocket->socketError() == QAbstractSocket::RemoteHostClosedError) {
+                && data->controlSocket->error() == QAbstractSocket::RemoteHostClosedError) {
            connectData->readBuffer.clear();
            emitReadNotification();
        }
@ -1056,7 +1056,7 @@ bool QSocks5SocketEngine::initialize(qintptr socketDescriptor, QAbstractSocket::
                         Qt::DirectConnection);
        QObject::connect(d->data->controlSocket, SIGNAL(bytesWritten(qint64)), this, SLOT(_q_controlSocketBytesWritten()),
                         Qt::DirectConnection);
-        QObject::connect(d->data->controlSocket, SIGNAL(error(QAbstractSocket::SocketError)), this, SLOT(_q_controlSocketError(QAbstractSocket::SocketError)),
+        QObject::connect(d->data->controlSocket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)), this, SLOT(_q_controlSocketErrorOccurred(QAbstractSocket::SocketError)),
                         Qt::DirectConnection);
        QObject::connect(d->data->controlSocket, SIGNAL(disconnected()), this, SLOT(_q_controlSocketDisconnected()),
                         Qt::DirectConnection);
@ -1231,7 +1231,7 @@ void QSocks5SocketEnginePrivate::_q_controlSocketBytesWritten()
    }
 }

-void QSocks5SocketEnginePrivate::_q_controlSocketError(QAbstractSocket::SocketError error)
+void QSocks5SocketEnginePrivate::_q_controlSocketErrorOccurred(QAbstractSocket::SocketError error)
 {
    QSOCKS5_D_DEBUG << "controlSocketError" << error << data->controlSocket->errorString();

@ -1256,7 +1256,7 @@ void QSocks5SocketEnginePrivate::_q_controlSocketError(QAbstractSocket::SocketEr
        data->controlSocket->close();
        emitConnectionNotification();
    } else {
-        q_func()->setError(data->controlSocket->socketError(), data->controlSocket->errorString());
+        q_func()->setError(data->controlSocket->error(), data->controlSocket->errorString());
        emitReadNotification();
        emitWriteNotification();
    }
@ -1348,7 +1348,7 @@ bool QSocks5SocketEngine::bind(const QHostAddress &addr, quint16 port)
    if (d->mode == QSocks5SocketEnginePrivate::UdpAssociateMode) {
        if (!d->udpData->udpSocket->bind(address, port)) {
            QSOCKS5_Q_DEBUG << "local udp bind failed";
-            setError(d->udpData->udpSocket->socketError(), d->udpData->udpSocket->errorString());
+            setError(d->udpData->udpSocket->error(), d->udpData->udpSocket->errorString());
            return false;
        }
        d->localAddress = d->udpData->udpSocket->localAddress();
@ -1656,8 +1656,8 @@ qint64 QSocks5SocketEngine::writeDatagram(const char *data, qint64 len, const QI
    }
    if (d->udpData->udpSocket->writeDatagram(sealedBuf, d->udpData->associateAddress, d->udpData->associatePort) != sealedBuf.size()) {
        //### try frgamenting
-        if (d->udpData->udpSocket->socketError() == QAbstractSocket::DatagramTooLargeError)
-            setError(d->udpData->udpSocket->socketError(), d->udpData->udpSocket->errorString());
+        if (d->udpData->udpSocket->error() == QAbstractSocket::DatagramTooLargeError)
+            setError(d->udpData->udpSocket->error(), d->udpData->udpSocket->errorString());
        //### else maybe more serious error
        return -1;
    }
@ -1727,7 +1727,7 @@ bool QSocks5SocketEnginePrivate::waitForConnected(int msecs, bool *timedOut)
                return true;

            setErrorState(QSocks5SocketEnginePrivate::ControlSocketError);
-            if (timedOut && data->controlSocket->socketError() == QAbstractSocket::SocketTimeoutError)
+            if (timedOut && data->controlSocket->error() == QAbstractSocket::SocketTimeoutError)
                *timedOut = true;
            return false;
        }
@ -1765,8 +1765,8 @@ bool QSocks5SocketEngine::waitForRead(int msecs, bool *timedOut)
                if (d->data->controlSocket->state() == QAbstractSocket::UnconnectedState)
                    return true;

-                setError(d->data->controlSocket->socketError(), d->data->controlSocket->errorString());
-                if (timedOut && d->data->controlSocket->socketError() == QAbstractSocket::SocketTimeoutError)
+                setError(d->data->controlSocket->error(), d->data->controlSocket->errorString());
+                if (timedOut && d->data->controlSocket->error() == QAbstractSocket::SocketTimeoutError)
                    *timedOut = true;
                return false;
            }
@ -1775,8 +1775,8 @@ bool QSocks5SocketEngine::waitForRead(int msecs, bool *timedOut)
    } else {
        while (!d->readNotificationActivated) {
            if (!d->udpData->udpSocket->waitForReadyRead(qt_subtract_from_timeout(msecs, stopWatch.elapsed()))) {
-                setError(d->udpData->udpSocket->socketError(), d->udpData->udpSocket->errorString());
-                if (timedOut && d->udpData->udpSocket->socketError() == QAbstractSocket::SocketTimeoutError)
+                setError(d->udpData->udpSocket->error(), d->udpData->udpSocket->errorString());
+                if (timedOut && d->udpData->udpSocket->error() == QAbstractSocket::SocketTimeoutError)
                    *timedOut = true;
                return false;
            }
--- a/src/network/socket/qsocks5socketengine_p.h
+++ b/src/network/socket/qsocks5socketengine_p.h
@ -130,7 +130,7 @@ private:
    Q_DISABLE_COPY_MOVE(QSocks5SocketEngine)
    Q_PRIVATE_SLOT(d_func(), void _q_controlSocketConnected())
    Q_PRIVATE_SLOT(d_func(), void _q_controlSocketReadNotification())
-    Q_PRIVATE_SLOT(d_func(), void _q_controlSocketError(QAbstractSocket::SocketError))
+    Q_PRIVATE_SLOT(d_func(), void _q_controlSocketErrorOccurred(QAbstractSocket::SocketError))
 #ifndef QT_NO_UDPSOCKET
    Q_PRIVATE_SLOT(d_func(), void _q_udpSocketReadNotification())
 #endif
@ -246,7 +246,7 @@ public:

    void _q_controlSocketConnected();
    void _q_controlSocketReadNotification();
-    void _q_controlSocketError(QAbstractSocket::SocketError);
+    void _q_controlSocketErrorOccurred(QAbstractSocket::SocketError);
 #ifndef QT_NO_UDPSOCKET
    void _q_udpSocketReadNotification();
 #endif
--- a/src/network/ssl/qdtls_openssl.cpp
+++ b/src/network/ssl/qdtls_openssl.cpp
@ -1125,7 +1125,7 @@ qint64 QDtlsPrivateOpenSSL::writeDatagramEncrypted(QUdpSocket *socket,
        // some errors can be just ignored (it's UDP, not TCP after all).
        // Unlike QSslSocket we do not abort though.
        QString description(QSslSocketBackendPrivate::getErrorsFromOpenSsl());
-        if (socket->socketError() != QAbstractSocket::UnknownSocketError && description.isEmpty()) {
+        if (socket->error() != QAbstractSocket::UnknownSocketError && description.isEmpty()) {
            setDtlsError(QDtlsError::UnderlyingSocketError, socket->errorString());
        } else {
            setDtlsError(QDtlsError::TlsFatalError,
--- a/src/network/ssl/qsslsocket.cpp
+++ b/src/network/ssl/qsslsocket.cpp
@ -676,7 +676,7 @@ bool QSslSocket::setSocketDescriptor(qintptr socketDescriptor, SocketState state
        d->createPlainSocket(openMode);
    bool retVal = d->plainSocket->setSocketDescriptor(socketDescriptor, state, openMode);
    d->cachedSocketDescriptor = d->plainSocket->socketDescriptor();
-    d->setError(d->plainSocket->socketError(), d->plainSocket->errorString());
+    d->setError(d->plainSocket->error(), d->plainSocket->errorString());
    setSocketState(state);
    setOpenMode(openMode);
    setLocalPort(d->plainSocket->localPort());
@ -1784,7 +1784,7 @@ bool QSslSocket::waitForConnected(int msecs)
    bool retVal = d->plainSocket->waitForConnected(msecs);
    if (!retVal) {
        setSocketState(d->plainSocket->state());
-        d->setError(d->plainSocket->socketError(), d->plainSocket->errorString());
+        d->setError(d->plainSocket->error(), d->plainSocket->errorString());
    }
    return retVal;
 }
@ -1953,7 +1953,7 @@ bool QSslSocket::waitForDisconnected(int msecs)
    bool retVal = d->plainSocket->waitForDisconnected(qt_subtract_from_timeout(msecs, stopWatch.elapsed()));
    if (!retVal) {
        setSocketState(d->plainSocket->state());
-        d->setError(d->plainSocket->socketError(), d->plainSocket->errorString());
+        d->setError(d->plainSocket->error(), d->plainSocket->errorString());
    }
    return retVal;
 }
@ -2681,7 +2681,7 @@ void QSslSocketPrivate::createPlainSocket(QIODevice::OpenMode openMode)
    q->connect(plainSocket, SIGNAL(stateChanged(QAbstractSocket::SocketState)),
               q, SLOT(_q_stateChangedSlot(QAbstractSocket::SocketState)),
               Qt::DirectConnection);
-    q->connect(plainSocket, SIGNAL(error(QAbstractSocket::SocketError)),
+    q->connect(plainSocket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)),
               q, SLOT(_q_errorSlot(QAbstractSocket::SocketError)),
               Qt::DirectConnection);
    q->connect(plainSocket, SIGNAL(readyRead()),
@ -2857,7 +2857,7 @@ void QSslSocketPrivate::_q_errorSlot(QAbstractSocket::SocketError error)
        readBufferMaxSize = tmpReadBufferMaxSize;
    }

-    setErrorAndEmit(plainSocket->socketError(), plainSocket->errorString());
+    setErrorAndEmit(plainSocket->error(), plainSocket->errorString());
 }

 /*!
--- a/src/network/ssl/qsslsocket_openssl.cpp
+++ b/src/network/ssl/qsslsocket_openssl.cpp
@ -1125,7 +1125,7 @@ void QSslSocketBackendPrivate::transmit()
            if (actualWritten < 0) {
                //plain socket write fails if it was in the pending close state.
                const ScopedBool bg(inSetAndEmitError, true);
-                setErrorAndEmit(plainSocket->socketError(), plainSocket->errorString());
+                setErrorAndEmit(plainSocket->error(), plainSocket->errorString());
                return;
            }
            transmitting = true;
--- a/src/network/ssl/qsslsocket_schannel.cpp
+++ b/src/network/ssl/qsslsocket_schannel.cpp
@ -576,7 +576,7 @@ bool QSslSocketBackendPrivate::sendToken(void *token, unsigned long tokenLength,
    if (written != qint64(tokenLength)) {
        // Failed to write/buffer everything or an error occurred
        if (emitError)
-            setErrorAndEmit(plainSocket->socketError(), plainSocket->errorString());
+            setErrorAndEmit(plainSocket->error(), plainSocket->errorString());
        return false;
    }
    return true;
@ -1286,7 +1286,7 @@ void QSslSocketBackendPrivate::transmit()
            if (bytesWritten >= 0) {
                totalBytesWritten += bytesWritten;
            } else {
-                setErrorAndEmit(plainSocket->socketError(), plainSocket->errorString());
+                setErrorAndEmit(plainSocket->error(), plainSocket->errorString());
                return;
            }
        }
--- a/src/platformsupport/fontdatabases/freetype/qfontengine_ft.cpp
+++ b/src/platformsupport/fontdatabases/freetype/qfontengine_ft.cpp
@ -1693,6 +1693,9 @@ glyph_metrics_t QFontEngineFT::boundingBox(const QGlyphLayout &glyphs)
    QFixed ymax = 0;
    QFixed xmax = 0;
    for (int i = 0; i < glyphs.numGlyphs; i++) {
+        // If shaping has found this should be ignored, ignore it.
+        if (!glyphs.advances[i] || glyphs.attributes[i].dontPrint)
+            continue;
        Glyph *g = cacheEnabled ? defaultGlyphSet.getGlyph(glyphs.glyphs[i]) : nullptr;
        if (!g) {
            if (!face)
--- a/src/plugins/platforms/wasm/qwasmbackingstore.cpp
+++ b/src/plugins/platforms/wasm/qwasmbackingstore.cpp
@ -36,7 +36,7 @@
 #include <QtGui/qpainter.h>
 #include <private/qguiapplication_p.h>
 #include <qpa/qplatformscreen.h>
-
+#include <QtGui/qoffscreensurface.h>
 #include <QtGui/qbackingstore.h>

 QT_BEGIN_NAMESPACE
@ -53,12 +53,29 @@ QWasmBackingStore::QWasmBackingStore(QWasmCompositor *compositor, QWindow *windo

 QWasmBackingStore::~QWasmBackingStore()
 {
+    auto window = this->window();
+    QWasmIntegration::get()->removeBackingStore(window);
+    destroy();
+    QWasmWindow *wasmWindow = static_cast<QWasmWindow *>(window->handle());
+    if (wasmWindow)
+        wasmWindow->setBackingStore(nullptr);
 }

 void QWasmBackingStore::destroy()
 {
-    if (m_texture->isCreated())
-        m_texture->destroy();
+    if (m_texture->isCreated()) {
+        auto context = m_compositor->context();
+        auto currentContext = QOpenGLContext::currentContext();
+        if (!currentContext || !QOpenGLContext::areSharing(context, currentContext)) {
+            QOffscreenSurface offScreenSurface(m_compositor->screen()->screen());
+            offScreenSurface.setFormat(context->format());
+            offScreenSurface.create();
+            context->makeCurrent(&offScreenSurface);
+            m_texture->destroy();
+        } else {
+            m_texture->destroy();
+        }
+    }
 }

 QPaintDevice *QWasmBackingStore::paintDevice()
@ -81,9 +98,9 @@ void QWasmBackingStore::updateTexture()
    if (m_dirty.isNull())
        return;

-    if (m_recreateTexture && m_texture->isCreated()) {
+    if (m_recreateTexture) {
        m_recreateTexture = false;
-        m_texture->destroy();
+        destroy();
    }

    if (!m_texture->isCreated()) {
--- a/src/plugins/platforms/wasm/qwasmcompositor.cpp
+++ b/src/plugins/platforms/wasm/qwasmcompositor.cpp
@ -58,7 +58,6 @@ QWasmCompositedWindow::QWasmCompositedWindow()

 QWasmCompositor::QWasmCompositor(QWasmScreen *screen)
    :QObject(screen)
-    , m_frameBuffer(nullptr)
    , m_blitter(new QOpenGLTextureBlitter)
    , m_needComposit(false)
    , m_inFlush(false)
@ -70,7 +69,6 @@ QWasmCompositor::QWasmCompositor(QWasmScreen *screen)

 QWasmCompositor::~QWasmCompositor()
 {
-    delete m_frameBuffer;
    destroy();
 }

@ -747,3 +745,8 @@ QWasmScreen *QWasmCompositor::screen()
 {
    return static_cast<QWasmScreen *>(parent());
 }
+
+QOpenGLContext *QWasmCompositor::context()
+{
+    return m_context.data();
+}
--- a/src/plugins/platforms/wasm/qwasmcompositor.h
+++ b/src/plugins/platforms/wasm/qwasmcompositor.h
@ -124,11 +124,13 @@ public:
    static QWasmTitleBarOptions makeTitleBarOptions(const QWasmWindow *window);
    static QRect titlebarRect(QWasmTitleBarOptions tb, QWasmCompositor::SubControls subcontrol);

+    QWasmScreen *screen();
+    QOpenGLContext *context();
+
 private slots:
    void frame();

 private:
-    QWasmScreen *screen();
    void notifyTopWindowChanged(QWasmWindow *window);
    void drawWindow(QOpenGLTextureBlitter *blitter, QWasmScreen *screen, QWasmWindow *window);
    void drawWindowContent(QOpenGLTextureBlitter *blitter, QWasmScreen *screen, QWasmWindow *window);
@ -137,7 +139,6 @@ private:
    void drawWindowDecorations(QOpenGLTextureBlitter *blitter, QWasmScreen *screen, QWasmWindow *window);
    void drwPanelButton();

-    QImage *m_frameBuffer;
    QScopedPointer<QOpenGLContext> m_context;
    QScopedPointer<QOpenGLTextureBlitter> m_blitter;

--- a/src/plugins/platforms/wasm/qwasmintegration.cpp
+++ b/src/plugins/platforms/wasm/qwasmintegration.cpp
@ -189,6 +189,11 @@ QPlatformBackingStore *QWasmIntegration::createPlatformBackingStore(QWindow *win
 #endif
 }

+void QWasmIntegration::removeBackingStore(QWindow* window)
+{
+    m_backingStores.remove(window);
+}
+
 #ifndef QT_NO_OPENGL
 QPlatformOpenGLContext *QWasmIntegration::createPlatformOpenGLContext(QOpenGLContext *context) const
 {
--- a/src/plugins/platforms/wasm/qwasmintegration.h
+++ b/src/plugins/platforms/wasm/qwasmintegration.h
@ -89,6 +89,7 @@ public:
    void resizeScreen(const emscripten::val &canvas);
    void resizeAllScreens();
    void updateDpi();
+    void removeBackingStore(QWindow* window);

 private:
    mutable QWasmFontDatabase *m_fontDb;
--- a/src/sql/doc/src/sql-driver.qdoc
+++ b/src/sql/doc/src/sql-driver.qdoc
@ -181,7 +181,7 @@
    Run the installer,
    select custom installation and install the MySQL C Connector
    which matches your Qt installation (x86 or x64).
-    After installation make sure that the needed files are there:
+    After installation check that the needed files are there:
    \list
    \li \c {<MySQL dir>/lib/libmysql.lib}
    \li \c {<MySQL dir>/lib/libmysql.dll}
@ -194,16 +194,20 @@
    \li \c {<MariaDB dir>/include/mysql.h}
    \endlist

-    Build the plugin as follows (here it is assumed that the MySQL
-    C Connector is installed in
+    \note As of MySQL 8.0.19, the C Connector is no longer offered as a standalone
+    installable component. Instead, you can get \c{mysql.h} and \c{libmysql.*} by
+    installing the full MySQL Server (x64 only) or the
+    \l{https://downloads.mariadb.org/connector-c/}{MariaDB C Connector}.
+
+    Build the plugin as follows (here it is assumed that \c{<MySQL dir>} is
    \c{C:/Program Files/MySQL/MySQL Connector C 6.1}):

    \snippet code/doc_src_sql-driver.qdoc 5

    If you are not using a Microsoft compiler, replace \c nmake with \c
-    mingw32-make in the line above.
+    mingw32-make above.

-    When you distribute your application, remember to include libmysql.dll / libmariadb.dll
+    When you distribute your application, remember to include \e libmysql.dll / \e libmariadb.dll
    in your installation package. It must be placed in the same folder
    as the application executable. \e libmysql.dll additionally needs the
    MSVC runtime libraries which can be installed with
--- a/src/widgets/dialogs/qfiledialog.cpp
+++ b/src/widgets/dialogs/qfiledialog.cpp
@ -1302,8 +1302,12 @@ QStringList QFileDialog::selectedFiles() const
    QStringList files;
    const QList<QUrl> userSelectedFiles = d->userSelectedFiles();
    files.reserve(userSelectedFiles.size());
-    for (const QUrl &file : userSelectedFiles)
-        files.append(file.toLocalFile());
+    for (const QUrl &file : userSelectedFiles) {
+        if (file.isLocalFile() || file.isEmpty())
+            files.append(file.toLocalFile());
+        else
+            files.append(file.toString());
+    }
    if (files.isEmpty() && d->usingWidgets()) {
        const FileMode fm = fileMode();
        if (fm != ExistingFile && fm != ExistingFiles)
@ -3151,7 +3155,7 @@ void QFileDialogPrivate::createWidgets()

    // filetype
    qFileDialogUi->fileTypeCombo->setDuplicatesEnabled(false);
-    qFileDialogUi->fileTypeCombo->setSizeAdjustPolicy(QComboBox::AdjustToMinimumContentsLength);
+    qFileDialogUi->fileTypeCombo->setSizeAdjustPolicy(QComboBox::AdjustToContentsOnFirstShow);
    qFileDialogUi->fileTypeCombo->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
    QObject::connect(qFileDialogUi->fileTypeCombo, SIGNAL(activated(int)),
                     q, SLOT(_q_useNameFilter(int)));
--- a/src/widgets/dialogs/qwizard.cpp
+++ b/src/widgets/dialogs/qwizard.cpp
@ -2384,12 +2384,22 @@ bool QWizard::hasVisitedPage(int theid) const

    \sa hasVisitedPage()
 */
-QList<int> QWizard::visitedPages() const
+QList<int> QWizard::visitedIds() const
 {
    Q_D(const QWizard);
    return d->history;
 }

+/*!
+    \obsolete Use visitedIds() instead
+*/
+#if QT_DEPRECATED_SINCE(5, 15)
+QList<int> QWizard::visitedPages() const
+{
+    return visitedIds();
+}
+#endif
+
 /*!
    Returns the list of page IDs.
   \since 4.5
--- a/src/widgets/dialogs/qwizard.h
+++ b/src/widgets/dialogs/qwizard.h
@ -128,7 +128,10 @@ public:
    void removePage(int id);
    QWizardPage *page(int id) const;
    bool hasVisitedPage(int id) const;
-    QList<int> visitedPages() const;    // ### Qt 6: visitedIds()?
+#if QT_DEPRECATED_SINCE(5, 15)
+    QList<int> visitedPages() const;
+#endif
+    QList<int> visitedIds() const;
    QList<int> pageIds() const;
    void setStartId(int id);
    int startId() const;
--- a/src/widgets/kernel/qshortcut.h
+++ b/src/widgets/kernel/qshortcut.h
@ -90,7 +90,8 @@ public:
    template<class Obj1, typename Func1>
    QShortcut(const QKeySequence &key, QWidget *parent,
              const Obj1 *object1, Func1 slot1,
-              Qt::ShortcutContext context = Qt::WindowShortcut)
+              Qt::ShortcutContext context = Qt::WindowShortcut,
+              typename std::enable_if<QtPrivate::IsPointerToTypeDerivedFromQObject<Obj1*>::Value>::type* = 0)
        : QShortcut(key, parent, static_cast<const char*>(nullptr), static_cast<const char*>(nullptr), context)
    {
        connect(this, &QShortcut::activated, object1, std::move(slot1));
@ -98,7 +99,8 @@ public:
    template<class Obj1, typename Func1, typename Func2>
    QShortcut(const QKeySequence &key, QWidget *parent,
              const Obj1 *object1, Func1 slot1, Func2 slot2,
-              Qt::ShortcutContext context = Qt::WindowShortcut)
+              Qt::ShortcutContext context = Qt::WindowShortcut,
+              typename std::enable_if<QtPrivate::IsPointerToTypeDerivedFromQObject<Obj1*>::Value>::type* = 0)
        : QShortcut(key, parent, static_cast<const char*>(nullptr), static_cast<const char*>(nullptr), context)
    {
        connect(this, &QShortcut::activated, object1, std::move(slot1));
@ -108,7 +110,9 @@ public:
    QShortcut(const QKeySequence &key, QWidget *parent,
              const Obj1 *object1, Func1 slot1,
              const Obj2 *object2, Func2 slot2,
-              Qt::ShortcutContext context = Qt::WindowShortcut)
+              Qt::ShortcutContext context = Qt::WindowShortcut,
+              typename std::enable_if<QtPrivate::IsPointerToTypeDerivedFromQObject<Obj1*>::Value>::type* = 0,
+              typename std::enable_if<QtPrivate::IsPointerToTypeDerivedFromQObject<Obj2*>::Value>::type* = 0)
        : QShortcut(key, parent, static_cast<const char*>(nullptr), static_cast<const char*>(nullptr), context)
    {
        connect(this, &QShortcut::activated, object1, std::move(slot1));
--- a/src/widgets/kernel/qwidget.cpp
+++ b/src/widgets/kernel/qwidget.cpp
@ -395,7 +395,7 @@ void QWidget::setAutoFillBackground(bool enabled)
    Every widget's constructor accepts one or two standard arguments:

    \list 1
-        \li  \c{QWidget *parent = \nullptr} is the parent of the new widget.
+        \li  \c{QWidget *parent = nullptr} is the parent of the new widget.
            If it is \nullptr (the default), the new widget will be a window.
            If not, it will be a child of \e parent, and be constrained by
            \e parent's geometry (unless you specify Qt::Window as window flag).
--- a/src/widgets/widgets/qcombobox.cpp
+++ b/src/widgets/widgets/qcombobox.cpp
@ -894,7 +894,7 @@ QStyleOptionComboBox QComboBoxPrivateContainer::comboStyleOption() const

    \value AdjustToContents              The combobox will always adjust to the contents
    \value AdjustToContentsOnFirstShow   The combobox will adjust to its contents the first time it is shown.
-    \value AdjustToMinimumContentsLength Use AdjustToContents or AdjustToContentsOnFirstShow instead.
+    \omitvalue AdjustToMinimumContentsLength
    \value AdjustToMinimumContentsLengthWithIcon The combobox will adjust to \l minimumContentsLength plus space for an icon. For performance reasons use this policy on large models.
 */

--- a/src/widgets/widgets/qcombobox.h
+++ b/src/widgets/widgets/qcombobox.h
@ -137,8 +137,11 @@ public:
    enum SizeAdjustPolicy {
        AdjustToContents,
        AdjustToContentsOnFirstShow,
-        AdjustToMinimumContentsLength, // ### Qt 6: remove
-        AdjustToMinimumContentsLengthWithIcon
+#if QT_DEPRECATED_SINCE(5, 15)
+        AdjustToMinimumContentsLength Q_DECL_ENUMERATOR_DEPRECATED_X(
+            "Use AdjustToContents or AdjustToContentsOnFirstShow"), // ### Qt 6: remove
+#endif
+        AdjustToMinimumContentsLengthWithIcon = AdjustToContentsOnFirstShow + 2
    };
    Q_ENUM(SizeAdjustPolicy)

--- a/src/widgets/widgets/qdatetimeedit.cpp
+++ b/src/widgets/widgets/qdatetimeedit.cpp
@ -683,7 +683,8 @@ void QDateTimeEdit::setTimeRange(QTime min, QTime max)
  \brief The currently displayed fields of the date time edit.

  Returns a bit set of the displayed sections for this format.
-  \a setDisplayFormat(), displayFormat()
+
+  \sa setDisplayFormat(), displayFormat()
 */

 QDateTimeEdit::Sections QDateTimeEdit::displayedSections() const
@ -696,7 +697,8 @@ QDateTimeEdit::Sections QDateTimeEdit::displayedSections() const
  \property QDateTimeEdit::currentSection

  \brief The current section of the spinbox.
-  \a setCurrentSection()
+
+  \sa setCurrentSection()
 */

 QDateTimeEdit::Section QDateTimeEdit::currentSection() const
@ -776,8 +778,7 @@ int QDateTimeEdit::sectionCount() const
  the cursorPosition is 5, currentSectionIndex returns 1. If the
  cursorPosition is 3, currentSectionIndex is 0, and so on.

-  \a setCurrentSection()
-  \sa currentSection()
+  \sa setCurrentSection(), currentSection()
 */

 int QDateTimeEdit::currentSectionIndex() const
@ -1448,7 +1449,16 @@ void QDateTimeEdit::fixup(QString &input) const
    QValidator::State state;
    int copy = d->edit->cursorPosition();

-    d->validateAndInterpret(input, copy, state, true);
+    QDateTime value = d->validateAndInterpret(input, copy, state, true);
+    /*
+        String was valid, but the datetime still is not; use the time that
+        has the same distance from epoch.
+        CorrectToPreviousValue correction is handled by QAbstractSpinBox.
+    */
+    if (!value.isValid() && d->correctionMode == QAbstractSpinBox::CorrectToNearestValue) {
+        value = QDateTime::fromMSecsSinceEpoch(value.toMSecsSinceEpoch(), value.timeSpec());
+        input = textFromDateTime(value);
+    }
 }


@ -2085,6 +2095,17 @@ QDateTime QDateTimeEditPrivate::stepBy(int sectionIndex, int steps, bool test) c
    const int oldDay = v.date().day(calendar);

    setDigit(v, sectionIndex, val);
+    /*
+        Stepping into a daylight saving time that doesn't exist,
+        so use the time that has the same distance from epoch.
+    */
+    if (!v.isValid()) {
+        auto msecsSinceEpoch = v.toMSecsSinceEpoch();
+        // decreasing from e.g 3am to 2am would get us back to 3am, but we want 1am
+        if (steps < 0 && sn.type & HourSectionMask)
+            msecsSinceEpoch -= 3600 * 1000;
+        v = QDateTime::fromMSecsSinceEpoch(msecsSinceEpoch, v.timeSpec());
+    }
    // if this sets year or month it will make
    // sure that days are lowered if needed.

--- a/src/widgets/widgets/qdockwidget.h
+++ b/src/widgets/widgets/qdockwidget.h
@ -78,7 +78,10 @@ public:
        DockWidgetVerticalTitleBar = 0x08,

        DockWidgetFeatureMask = 0x0f,
-        AllDockWidgetFeatures = DockWidgetClosable|DockWidgetMovable|DockWidgetFloatable, // ### Qt 6: remove
+#if QT_DEPRECATED_SINCE(5, 15)
+        AllDockWidgetFeatures Q_DECL_ENUMERATOR_DEPRECATED =
+            DockWidgetClosable|DockWidgetMovable|DockWidgetFloatable, // ### Qt 6: remove
+#endif
        NoDockWidgetFeatures  = 0x00,

        Reserved              = 0xff
--- a/src/widgets/widgets/qlcdnumber.cpp
+++ b/src/widgets/widgets/qlcdnumber.cpp
@ -713,7 +713,7 @@ void QLCDNumber::paintEvent(QPaintEvent *)
 void QLCDNumberPrivate::internalSetString(const QString& s)
 {
    Q_Q(QLCDNumber);
-    QString buffer;
+    QString buffer(ndigits, QChar());
    int i;
    int len = s.length();
    QBitArray newPoints(ndigits);
--- a/src/widgets/widgets/qlineedit.cpp
+++ b/src/widgets/widgets/qlineedit.cpp
@ -1202,8 +1202,8 @@ QMargins QLineEdit::textMargins() const

    The input mask is an input template string. It can contain the following elements:
    \table
-    \row \li Mask Characters \li Defines the class of input characters that are
-    considered valid in this position
+    \row \li Mask Characters \li Defines the \l {QChar::} {Category} of input characters
+    that are considered valid in this position
    \row \li Meta Characters \li Various special meanings
    \row \li Separators \li All other characters are regarded as immutable separators
    \endtable
@ -1212,17 +1212,21 @@ QMargins QLineEdit::textMargins() const

    \table
    \header \li Mask Character \li Meaning
-    \row \li \c A \li ASCII alphabetic character required. A-Z, a-z.
-    \row \li \c a \li ASCII alphabetic character permitted but not required.
-    \row \li \c N \li ASCII alphanumeric character required. A-Z, a-z, 0-9.
-    \row \li \c n \li ASCII alphanumeric character permitted but not required.
+    \row \li \c A \li character of the Letter category required, such as A-Z, a-z.
+    \row \li \c a \li character of the Letter category permitted but not required.
+    \row \li \c N \li character of the Letter or Number category required, such as
+                      A-Z, a-z, 0-9.
+    \row \li \c n \li character of the Letter or Number category permitted but not required.
    \row \li \c X \li Any non-blank character required.
    \row \li \c x \li Any non-blank character permitted but not required.
-    \row \li \c 9 \li ASCII digit required. 0-9.
-    \row \li \c 0 \li ASCII digit permitted but not required.
-    \row \li \c D \li ASCII digit required. 1-9.
-    \row \li \c d \li ASCII digit permitted but not required (1-9).
-    \row \li \c # \li ASCII digit or plus/minus sign permitted but not required.
+    \row \li \c 9 \li character of the Number category required, e.g 0-9.
+    \row \li \c 0 \li character of the Number category permitted but not required.
+    \row \li \c D \li character of the Number category and larger than zero required,
+                      such as 1-9
+    \row \li \c d \li character of the Number category and larger than zero permitted but not
+                      required, such as 1-9.
+    \row \li \c # \li character of the Number category, or plus/minus sign permitted but not
+                      required.
    \row \li \c H \li Hexadecimal character required. A-F, a-f, 0-9.
    \row \li \c h \li Hexadecimal character permitted but not required.
    \row \li \c B \li Binary character required. 0-1.
@ -1264,7 +1268,7 @@ QMargins QLineEdit::textMargins() const
    To get range control (e.g., for an IP address) use masks together
    with \l{setValidator()}{validators}.

-    \sa maxLength
+    \sa maxLength, QChar::isLetter(), QChar::isNumber(), QChar::digitValue()
 */
 QString QLineEdit::inputMask() const
 {
--- a/src/widgets/widgets/qstatusbar.h
+++ b/src/widgets/widgets/qstatusbar.h
@ -83,7 +83,6 @@ protected:
    void paintEvent(QPaintEvent *) override;
    void resizeEvent(QResizeEvent *) override;

-    // ### Qt 6: consider making reformat() and hideOrShow() private
    void reformat();
    void hideOrShow();
    bool event(QEvent *) override;
--- a/tests/auto/corelib/io/qsettings/tst_qsettings.cpp
+++ b/tests/auto/corelib/io/qsettings/tst_qsettings.cpp
@ -2335,14 +2335,15 @@ void tst_QSettings::testRegistry32And64Bit()

 void tst_QSettings::trailingWhitespace()
 {
+    const QString path = settingsPath("trailingWhitespace");
    {
-        QSettings s("tst_QSettings_trailingWhitespace");
+        QSettings s(path, QSettings::IniFormat);
        s.setValue("trailingSpace", "x  ");
        s.setValue("trailingTab", "x\t");
        s.setValue("trailingNewline", "x\n");
    }
    {
-        QSettings s("tst_QSettings_trailingWhitespace");
+        QSettings s(path, QSettings::IniFormat);
        QCOMPARE(s.value("trailingSpace").toString(), QLatin1String("x  "));
        QCOMPARE(s.value("trailingTab").toString(), QLatin1String("x\t"));
        QCOMPARE(s.value("trailingNewline").toString(), QLatin1String("x\n"));
--- a/tests/auto/corelib/kernel/qdeadlinetimer/tst_qdeadlinetimer.cpp
+++ b/tests/auto/corelib/kernel/qdeadlinetimer/tst_qdeadlinetimer.cpp
@ -580,11 +580,26 @@ void tst_QDeadlineTimer::stdchrono()
    auto now = QDeadlineTimer::current(timerType);
    QTest::qSleep(minResolution);

+    auto sampling_start = steady_clock::now();
+    auto steady_deadline = now.deadline<steady_clock>();
+    auto system_deadline = now.deadline<system_clock>();
    auto steady_after = steady_clock::now();
    auto system_after = system_clock::now();
+    auto sampling_end = steady_clock::now();
+
+    auto sampling_diff = duration_cast<milliseconds>(sampling_end - sampling_start).count();
+    if (sampling_diff > minResolution/2) {
+        qWarning() << "Sampling clock took" << sampling_diff << "ms";
+        QSKIP("Sampling clock took too long, aborting test", Abort);
+    }
+    auto total_diff = duration_cast<milliseconds>(steady_after - steady_before).count();
+    if (total_diff >= 3*minResolution) {
+        qWarning() << "Measurement took" << total_diff << "ms";
+        QSKIP("Measurement took too long, aborting test", Abort);
+    }

    {
-        auto diff = duration_cast<milliseconds>(steady_after - now.deadline<steady_clock>());
+        auto diff = duration_cast<milliseconds>(steady_after - steady_deadline);
        QVERIFY2(diff.count() > minResolution/2, QByteArray::number(qint64(diff.count())));
        QVERIFY2(diff.count() < 3*minResolution/2, QByteArray::number(qint64(diff.count())));
        QDeadlineTimer dt_after(steady_after, timerType);
@ -592,7 +607,7 @@ void tst_QDeadlineTimer::stdchrono()
                 ("now = " + QLocale().toString(now.deadlineNSecs()) +
                 "; after = " + QLocale().toString(dt_after.deadlineNSecs())).toLatin1());

-        diff = duration_cast<milliseconds>(now.deadline<steady_clock>() - steady_before);
+        diff = duration_cast<milliseconds>(steady_deadline - steady_before);
        QVERIFY2(diff.count() > minResolution/2, QByteArray::number(qint64(diff.count())));
        QVERIFY2(diff.count() < 3*minResolution/2, QByteArray::number(qint64(diff.count())));
        QDeadlineTimer dt_before(steady_before, timerType);
@ -601,7 +616,7 @@ void tst_QDeadlineTimer::stdchrono()
                 "; before = " + QLocale().toString(dt_before.deadlineNSecs())).toLatin1());
    }
    {
-        auto diff = duration_cast<milliseconds>(system_after - now.deadline<system_clock>());
+        auto diff = duration_cast<milliseconds>(system_after - system_deadline);
        QVERIFY2(diff.count() > minResolution/2, QByteArray::number(qint64(diff.count())));
        QVERIFY2(diff.count() < 3*minResolution/2, QByteArray::number(qint64(diff.count())));
        QDeadlineTimer dt_after(system_after, timerType);
@ -609,7 +624,7 @@ void tst_QDeadlineTimer::stdchrono()
                 ("now = " + QLocale().toString(now.deadlineNSecs()) +
                 "; after = " + QLocale().toString(dt_after.deadlineNSecs())).toLatin1());

-        diff = duration_cast<milliseconds>(now.deadline<system_clock>() - system_before);
+        diff = duration_cast<milliseconds>(system_deadline - system_before);
        QVERIFY2(diff.count() > minResolution/2, QByteArray::number(qint64(diff.count())));
        QVERIFY2(diff.count() < 3*minResolution/2, QByteArray::number(qint64(diff.count())));
        QDeadlineTimer dt_before(system_before, timerType);
--- a/tests/auto/corelib/kernel/qobject/tst_qobject.cpp
+++ b/tests/auto/corelib/kernel/qobject/tst_qobject.cpp
@ -7416,6 +7416,12 @@ void tst_QObject::checkArgumentsForNarrowing()
    FITS(bool, const QObject *&);
    FITS(int (*)(bool), void (QObject::*)());

+    {
+        // wg21.link/P1957
+        NARROWS(char*, bool);
+        NARROWS(void (QObject::*)(), bool);
+    }
+
 #undef IS_UNSCOPED_ENUM_SIGNED

 #undef NARROWS_IF
--- a/tests/auto/corelib/serialization/qxmlstream/tst_qxmlstream.cpp
+++ b/tests/auto/corelib/serialization/qxmlstream/tst_qxmlstream.cpp
@ -397,8 +397,6 @@ public:
                return true;
            }

-            QXmlStreamReader reader(&inputFile);
-
            /* See testcases.dtd which reads: 'Nonvalidating parsers
             * must also accept "invalid" testcases, but validating ones must reject them.' */
            if(type == QLatin1String("invalid") || type == QLatin1String("valid"))
@ -583,6 +581,8 @@ private slots:
    void roundTrip() const;
    void roundTrip_data() const;

+    void entityExpansionLimit() const;
+
 private:
    static QByteArray readFile(const QString &filename);

@ -1755,6 +1755,46 @@ void tst_QXmlStream::roundTrip_data() const
        "</root>\n";
 }

+void tst_QXmlStream::entityExpansionLimit() const
+{
+    QString xml = QStringLiteral("<?xml version=\"1.0\"?>"
+                                 "<!DOCTYPE foo ["
+                                 "<!ENTITY a \"0123456789\" >"
+                                 "<!ENTITY b \"&a;&a;&a;&a;&a;&a;&a;&a;&a;&a;\" >"
+                                 "<!ENTITY c \"&b;&b;&b;&b;&b;&b;&b;&b;&b;&b;\" >"
+                                 "<!ENTITY d \"&c;&c;&c;&c;&c;&c;&c;&c;&c;&c;\" >"
+                                 "]>"
+                                 "<foo>&d;&d;&d;</foo>");
+    {
+        QXmlStreamReader reader(xml);
+        QCOMPARE(reader.entityExpansionLimit(), 4096);
+        do {
+            reader.readNext();
+        } while (!reader.atEnd());
+        QCOMPARE(reader.error(), QXmlStreamReader::NotWellFormedError);
+    }
+
+    // &d; expands to 10k characters, minus the 3 removed (&d;) means it should fail
+    // with a limit of 9996 chars and pass with 9997
+    {
+        QXmlStreamReader reader(xml);
+        reader.setEntityExpansionLimit(9996);
+        do {
+            reader.readNext();
+        } while (!reader.atEnd());
+
+        QCOMPARE(reader.error(), QXmlStreamReader::NotWellFormedError);
+    }
+    {
+        QXmlStreamReader reader(xml);
+        reader.setEntityExpansionLimit(9997);
+        do {
+            reader.readNext();
+        } while (!reader.atEnd());
+        QCOMPARE(reader.error(), QXmlStreamReader::NoError);
+    }
+}
+
 void tst_QXmlStream::roundTrip() const
 {
    QFETCH(QString, in);
--- a/tests/auto/gui/image/qimagereader/tst_qimagereader.cpp
+++ b/tests/auto/gui/image/qimagereader/tst_qimagereader.cpp
@ -1081,7 +1081,7 @@ private slots:
    void acceptNewConnection()
    {
        serverSocket = server.nextPendingConnection();
-        connect(serverSocket, SIGNAL(error(QAbstractSocket::SocketError)),
+        connect(serverSocket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)),
                this, SLOT(remoteHostClosed()));
    }

--- a/tests/auto/gui/text/qfontmetrics/tst_qfontmetrics.cpp
+++ b/tests/auto/gui/text/qfontmetrics/tst_qfontmetrics.cpp
@ -59,6 +59,7 @@ private slots:
    void mnemonicTextWidth();
    void leadingBelowLine();
    void elidedMetrics();
+    void zeroWidthMetrics();
 };

 void tst_QFontMetrics::same()
@ -358,5 +359,28 @@ void tst_QFontMetrics::elidedMetrics()
    QFontDatabase::removeApplicationFont(id);
 }

+void tst_QFontMetrics::zeroWidthMetrics()
+{
+    QString zwnj(QChar(0x200c));
+    QString zwsp(QChar(0x200b));
+
+    QFont font;
+    QFontMetricsF fm(font);
+    QCOMPARE(fm.horizontalAdvance(zwnj), 0);
+    QCOMPARE(fm.horizontalAdvance(zwsp), 0);
+    QCOMPARE(fm.boundingRect(zwnj).width(), 0);
+    QCOMPARE(fm.boundingRect(zwsp).width(), 0);
+
+    QString string1 = QStringLiteral("(") + zwnj + QStringLiteral(")");
+    QString string2 = QStringLiteral("(") + zwnj + zwnj + QStringLiteral(")");
+    QString string3 = QStringLiteral("(") + zwsp + QStringLiteral(")");
+    QString string4 = QStringLiteral("(") + zwsp + zwsp + QStringLiteral(")");
+
+    QCOMPARE(fm.horizontalAdvance(string1), fm.horizontalAdvance(string2));
+    QCOMPARE(fm.horizontalAdvance(string3), fm.horizontalAdvance(string4));
+    QCOMPARE(fm.boundingRect(string1).width(), fm.boundingRect(string2).width());
+    QCOMPARE(fm.boundingRect(string3).width(), fm.boundingRect(string4).width());
+}
+
 QTEST_MAIN(tst_QFontMetrics)
 #include "tst_qfontmetrics.moc"
--- a/tests/auto/network-settings.h
+++ b/tests/auto/network-settings.h
@ -190,7 +190,7 @@ public:
        if (!s.peerAddress().isNull())
            debug << ", peer=" << s.peerAddress().toString() << ':' << s.peerPort();
        debug << ", type=" << s.socketType() << ", state=" << s.state()
-            << ", error=" << s.socketError() << ": " << s.errorString();
+            << ", error=" << s.error() << ": " << s.errorString();
       return result.toLocal8Bit();
    }
 #endif // QT_NETWORK_LIB
--- a/tests/auto/network/access/http2/tst_http2.cpp
+++ b/tests/auto/network/access/http2/tst_http2.cpp
@ -279,7 +279,7 @@ void tst_Http2::singleRequest()
    QVERIFY(prefaceOK);
    QVERIFY(serverGotSettingsACK);

-    QCOMPARE(reply->networkError(), QNetworkReply::NoError);
+    QCOMPARE(reply->error(), QNetworkReply::NoError);
    QVERIFY(reply->isFinished());
 }

@ -444,7 +444,7 @@ void tst_Http2::pushPromise()
    QVERIFY(prefaceOK);
    QVERIFY(serverGotSettingsACK);

-    QCOMPARE(reply->networkError(), QNetworkReply::NoError);
+    QCOMPARE(reply->error(), QNetworkReply::NoError);
    QVERIFY(reply->isFinished());

    // Now, the most interesting part!
@ -466,7 +466,7 @@ void tst_Http2::pushPromise()
    QCOMPARE(nSentRequests, 0);
    // Decreased by replyFinished():
    QCOMPARE(nRequests, 0);
-    QCOMPARE(reply->networkError(), QNetworkReply::NoError);
+    QCOMPARE(reply->error(), QNetworkReply::NoError);
    QVERIFY(reply->isFinished());
 }

@ -511,7 +511,7 @@ void tst_Http2::goaway()
        QNetworkRequest request(url);
        request.setAttribute(QNetworkRequest::Http2AllowedAttribute, QVariant(true));
        replies[i] = manager->get(request);
-        QCOMPARE(replies[i]->networkError(), QNetworkReply::NoError);
+        QCOMPARE(replies[i]->error(), QNetworkReply::NoError);
        void (QNetworkReply::*errorSignal)(QNetworkReply::NetworkError) =
            &QNetworkReply::error;
        connect(replies[i], errorSignal, this, &tst_Http2::replyFinishedWithError);
@ -671,7 +671,7 @@ void tst_Http2::connectToHost()
    connect(reply, &QNetworkReply::finished, [this, reply]() {
        --nRequests;
        eventLoop.exitLoop();
-        QCOMPARE(reply->networkError(), QNetworkReply::NoError);
+        QCOMPARE(reply->error(), QNetworkReply::NoError);
        QVERIFY(reply->isFinished());
        // Nothing received back:
        QVERIFY(reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).isNull());
@ -698,7 +698,7 @@ void tst_Http2::connectToHost()
    QVERIFY(prefaceOK);
    QVERIFY(serverGotSettingsACK);

-    QCOMPARE(reply->networkError(), QNetworkReply::NoError);
+    QCOMPARE(reply->error(), QNetworkReply::NoError);
    QVERIFY(reply->isFinished());
 }

@ -927,10 +927,10 @@ void tst_Http2::replyFinished()
    QVERIFY(nRequests);

    if (const auto reply = qobject_cast<QNetworkReply *>(sender())) {
-        if (reply->networkError() != QNetworkReply::NoError)
+        if (reply->error() != QNetworkReply::NoError)
            stopEventLoop();

-        QCOMPARE(reply->networkError(), QNetworkReply::NoError);
+        QCOMPARE(reply->error(), QNetworkReply::NoError);

        const QVariant http2Used(reply->attribute(QNetworkRequest::Http2WasUsedAttribute));
        if (!http2Used.isValid() || !http2Used.toBool())
@ -960,9 +960,9 @@ void tst_Http2::replyFinishedWithError()
    if (const auto reply = qobject_cast<QNetworkReply *>(sender())) {
        // For now this is a 'generic' code, it just verifies some error was
        // reported without testing its type.
-        if (reply->networkError() == QNetworkReply::NoError)
+        if (reply->error() == QNetworkReply::NoError)
            stopEventLoop();
-        QVERIFY(reply->networkError() != QNetworkReply::NoError);
+        QVERIFY(reply->error() != QNetworkReply::NoError);
    }

    --nRequests;
--- a/tests/auto/network/access/qabstractnetworkcache/tst_qabstractnetworkcache.cpp
+++ b/tests/auto/network/access/qabstractnetworkcache/tst_qabstractnetworkcache.cpp
@ -322,10 +322,10 @@ void tst_QAbstractNetworkCache::runTest()

    QByteArray secondData = reply2->readAll();
    if (!fetchFromCache && cacheLoadControl == QNetworkRequest::AlwaysCache) {
-        QCOMPARE(reply2->networkError(), QNetworkReply::ContentNotFoundError);
+        QCOMPARE(reply2->error(), QNetworkReply::ContentNotFoundError);
        QCOMPARE(secondData, QByteArray());
    } else {
-        QCOMPARE(reply2->networkError(), QNetworkReply::NoError);
+        QCOMPARE(reply2->error(), QNetworkReply::NoError);
        QCOMPARE(QString(secondData), QString(goodData));
        QCOMPARE(secondData, goodData);
        QCOMPARE(reply2->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt(), 200);
@ -375,12 +375,12 @@ void tst_QAbstractNetworkCache::checkSynchronous()

    QByteArray secondData = reply2->readAll();
    if (!fetchFromCache && cacheLoadControl == QNetworkRequest::AlwaysCache) {
-        QCOMPARE(reply2->networkError(), QNetworkReply::ContentNotFoundError);
+        QCOMPARE(reply2->error(), QNetworkReply::ContentNotFoundError);
        QCOMPARE(secondData, QByteArray());
    } else {
-        if (reply2->networkError() != QNetworkReply::NoError)
+        if (reply2->error() != QNetworkReply::NoError)
            qDebug() << reply2->errorString();
-        QCOMPARE(reply2->networkError(), QNetworkReply::NoError);
+        QCOMPARE(reply2->error(), QNetworkReply::NoError);
        QCOMPARE(QString(secondData), QString(goodData));
        QCOMPARE(secondData, goodData);
        QCOMPARE(reply2->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt(), 200);
--- a/tests/auto/network/access/qnetworkreply/tst_qnetworkreply.cpp
+++ b/tests/auto/network/access/qnetworkreply/tst_qnetworkreply.cpp
--- a/tests/auto/network/socket/qhttpsocketengine/tst_qhttpsocketengine.cpp
+++ b/tests/auto/network/socket/qhttpsocketengine/tst_qhttpsocketengine.cpp
@ -270,12 +270,12 @@ void tst_QHttpSocketEngine::errorTest()
    socket.setProxy(QNetworkProxy(QNetworkProxy::HttpProxy, hostname, port, username, username));
    socket.connectToHost("0.1.2.3", 12345);

-    connect(&socket, SIGNAL(error(QAbstractSocket::SocketError)),
+    connect(&socket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)),
            &QTestEventLoop::instance(), SLOT(exitLoop()));
    QTestEventLoop::instance().enterLoop(30);
    QVERIFY(!QTestEventLoop::instance().timeout());

-    QCOMPARE(int(socket.socketError()), expectedError);
+    QCOMPARE(int(socket.error()), expectedError);
 }

 //---------------------------------------------------------------------------
--- a/tests/auto/network/socket/qsocks5socketengine/tst_qsocks5socketengine.cpp
+++ b/tests/auto/network/socket/qsocks5socketengine/tst_qsocks5socketengine.cpp
@ -283,12 +283,12 @@ void tst_QSocks5SocketEngine::errorTest()
    socket.setProxy(QNetworkProxy(QNetworkProxy::Socks5Proxy, hostname, port, username, username));
    socket.connectToHost("0.1.2.3", 12345);

-    connect(&socket, SIGNAL(error(QAbstractSocket::SocketError)),
+    connect(&socket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)),
            &QTestEventLoop::instance(), SLOT(exitLoop()));
    QTestEventLoop::instance().enterLoop(10);
    QVERIFY(!QTestEventLoop::instance().timeout());

-    QCOMPARE(int(socket.socketError()), expectedError);
+    QCOMPARE(int(socket.error()), expectedError);
 }

 //---------------------------------------------------------------------------
@ -753,7 +753,7 @@ void tst_QSocks5SocketEngine::downloadBigFile()
                    QTestEventLoop::instance().exitLoop();
            });

-    connect(&socket, QOverload<QAbstractSocket::SocketError>::of(&QAbstractSocket::error),
+    connect(&socket, &QAbstractSocket::errorOccurred,
            [&socket, &stopWatch] (QAbstractSocket::SocketError errorCode)
            {
                qWarning().noquote().nospace() << QTest::currentTestFunction()
@ -1006,12 +1006,12 @@ void tst_QSocks5SocketEngine::incomplete()

    connect(&socket, SIGNAL(connected()),
            &QTestEventLoop::instance(), SLOT(exitLoop()));
-    connect(&socket, SIGNAL(error(QAbstractSocket::SocketError)),
+    connect(&socket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)),
            &QTestEventLoop::instance(), SLOT(exitLoop()));
    QTestEventLoop::instance().enterLoop(70);
    QVERIFY(!QTestEventLoop::instance().timeout());

-    QCOMPARE(socket.socketError(), QAbstractSocket::ProxyConnectionClosedError);
+    QCOMPARE(socket.error(), QAbstractSocket::ProxyConnectionClosedError);
 }

 //----------------------------------------------------------------------------------
--- a/tests/auto/network/socket/qtcpsocket/tst_qtcpsocket.cpp
+++ b/tests/auto/network/socket/qtcpsocket/tst_qtcpsocket.cpp
@ -493,7 +493,7 @@ void tst_QTcpSocket::constructing()
    QCOMPARE(socket->peerAddress(), QHostAddress());
    QCOMPARE(socket->readChannelCount(), 0);
    QCOMPARE(socket->writeChannelCount(), 0);
-    QCOMPARE(socket->socketError(), QTcpSocket::UnknownSocketError);
+    QCOMPARE(socket->error(), QTcpSocket::UnknownSocketError);
    QCOMPARE(socket->errorString(), QString("Unknown error"));

    // Check the state of the socket layer?
@ -603,7 +603,7 @@ void tst_QTcpSocket::bind()
            }

            bool bindSuccess = socket->bind(addr, port);
-            if (!bindSuccess && randomPort && socket->socketError() == QTcpSocket::AddressInUseError) {
+            if (!bindSuccess && randomPort && socket->error() == QTcpSocket::AddressInUseError) {
                // we may have been unlucky and hit an already open port, so try another
                --attemptsLeft;
                continue;
@ -730,7 +730,7 @@ void tst_QTcpSocket::setInvalidSocketDescriptor()
    QVERIFY(!socket->setSocketDescriptor(-5, QTcpSocket::UnconnectedState));
    QCOMPARE(socket->socketDescriptor(), (qintptr)-1);

-    QCOMPARE(socket->socketError(), QTcpSocket::UnsupportedSocketOperationError);
+    QCOMPARE(socket->error(), QTcpSocket::UnsupportedSocketOperationError);

    delete socket;
 }
@ -893,7 +893,7 @@ void tst_QTcpSocket::hostNotFound()
                         "when we expect 404", Continue);
    }
 #endif
-    QCOMPARE(int(socket->socketError()), int(QTcpSocket::HostNotFoundError));
+    QCOMPARE(int(socket->error()), int(QTcpSocket::HostNotFoundError));

    delete socket;
 }
@ -919,7 +919,7 @@ void tst_QTcpSocket::timeoutConnect()
    QVERIFY(timer.elapsed() < 150);
    QVERIFY(!socket->waitForConnected(1000)); //200ms is too short when using SOCKS proxy authentication
    QCOMPARE(socket->state(), QTcpSocket::UnconnectedState);
-    QCOMPARE(int(socket->socketError()), int(QTcpSocket::SocketTimeoutError));
+    QCOMPARE(int(socket->error()), int(QTcpSocket::SocketTimeoutError));
    QCOMPARE(socket->readChannelCount(), 0);
    QCOMPARE(socket->writeChannelCount(), 0);

@ -1238,7 +1238,7 @@ void tst_QTcpSocket::openCloseOpenClose()
        QCOMPARE(socket->localAddress(), QHostAddress());
        QCOMPARE((int) socket->peerPort(), 0);
        QCOMPARE(socket->peerAddress(), QHostAddress());
-        QCOMPARE(socket->socketError(), QTcpSocket::UnknownSocketError);
+        QCOMPARE(socket->error(), QTcpSocket::UnknownSocketError);
        QCOMPARE(socket->errorString(), QString("Unknown error"));

        QCOMPARE(socket->state(), QTcpSocket::UnconnectedState);
@ -1392,7 +1392,7 @@ protected:
        while (!quit) {
            if (socket->waitForDisconnected(500))
                break;
-            if (socket->socketError() != QAbstractSocket::SocketTimeoutError)
+            if (socket->error() != QAbstractSocket::SocketTimeoutError)
                return;
        }

@ -1628,8 +1628,8 @@ void tst_QTcpSocket::readLine()

    QVERIFY(!socket->waitForReadyRead(100));
    QCOMPARE(socket->readLine(buffer, sizeof(buffer)), qint64(0));
-    QVERIFY(socket->socketError() == QAbstractSocket::SocketTimeoutError
-            || socket->socketError() == QAbstractSocket::RemoteHostClosedError);
+    QVERIFY(socket->error() == QAbstractSocket::SocketTimeoutError
+            || socket->error() == QAbstractSocket::RemoteHostClosedError);
    QCOMPARE(socket->bytesAvailable(), qint64(0));

    socket->close();
@ -1778,11 +1778,11 @@ void tst_QTcpSocket::dontCloseOnTimeout()
    QTcpSocket *socket = newSocket();
    socket->connectToHost(serverAddress, server.serverPort());
    QVERIFY(!socket->waitForReadyRead(100));
-    QCOMPARE(socket->socketError(), QTcpSocket::SocketTimeoutError);
+    QCOMPARE(socket->error(), QTcpSocket::SocketTimeoutError);
    QVERIFY(socket->isOpen());

    QVERIFY(!socket->waitForDisconnected(100));
-    QCOMPARE(socket->socketError(), QTcpSocket::SocketTimeoutError);
+    QCOMPARE(socket->error(), QTcpSocket::SocketTimeoutError);
    QVERIFY(socket->isOpen());

    delete socket;
@ -2019,14 +2019,14 @@ void tst_QTcpSocket::remoteCloseError()
    QCOMPARE(clientSocket->bytesAvailable(), qint64(5));

    qRegisterMetaType<QAbstractSocket::SocketError>("QAbstractSocket::SocketError");
-    QSignalSpy errorSpy(clientSocket, SIGNAL(error(QAbstractSocket::SocketError)));
+    QSignalSpy errorSpy(clientSocket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)));
    QSignalSpy disconnectedSpy(clientSocket, SIGNAL(disconnected()));

    clientSocket->write("World");
    serverSocket->disconnectFromHost();

    tmpSocket = clientSocket;
-    connect(clientSocket, SIGNAL(error(QAbstractSocket::SocketError)),
+    connect(clientSocket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)),
            this, SLOT(remoteCloseErrorSlot()));

    enterLoop(30);
@ -2034,7 +2034,7 @@ void tst_QTcpSocket::remoteCloseError()

    QCOMPARE(disconnectedSpy.count(), 1);
    QCOMPARE(errorSpy.count(), 1);
-    QCOMPARE(clientSocket->socketError(), QAbstractSocket::RemoteHostClosedError);
+    QCOMPARE(clientSocket->error(), QAbstractSocket::RemoteHostClosedError);

    delete serverSocket;

@ -2079,7 +2079,7 @@ void tst_QTcpSocket::nestedEventLoopInErrorSlot()
 {
    QTcpSocket *socket = newSocket();
    QPointer<QTcpSocket> p(socket);
-    connect(socket, SIGNAL(error(QAbstractSocket::SocketError)), this, SLOT(enterLoopSlot()));
+    connect(socket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)), this, SLOT(enterLoopSlot()));

    socket->connectToHost("hostnotfoundhostnotfound.qt-project.org", 9999);
    enterLoop(30);
@ -2109,7 +2109,7 @@ void tst_QTcpSocket::connectToHostError()
    QFETCH(int, port);
    QFETCH(QAbstractSocket::SocketError, expectedError);

-    connect(socket, QOverload<QAbstractSocket::SocketError>::of(&QAbstractSocket::error),[&](QAbstractSocket::SocketError socketError){
+    connect(socket, &QAbstractSocket::errorOccurred, [&](QAbstractSocket::SocketError socketError){
        error = socketError;
    });
    socket->connectToHost(host, port); // no service running here, one suspects
@ -2326,7 +2326,7 @@ void tst_QTcpSocket::abortiveClose()

    qRegisterMetaType<QAbstractSocket::SocketError>("QAbstractSocket::SocketError");
    QSignalSpy readyReadSpy(clientSocket, SIGNAL(readyRead()));
-    QSignalSpy errorSpy(clientSocket, SIGNAL(error(QAbstractSocket::SocketError)));
+    QSignalSpy errorSpy(clientSocket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)));

    connect(clientSocket, SIGNAL(disconnected()), this, SLOT(exitLoopSlot()));
    QTimer::singleShot(0, this, SLOT(abortiveClose_abortSlot()));
@ -2402,7 +2402,7 @@ void tst_QTcpSocket::zeroAndMinusOneReturns()

    socket->write("GET / HTTP/1.0\r\n\r\n");
    QVERIFY(socket->waitForDisconnected(15000));
-    QCOMPARE(socket->socketError(), QAbstractSocket::RemoteHostClosedError);
+    QCOMPARE(socket->error(), QAbstractSocket::RemoteHostClosedError);

    QCOMPARE(socket->write("BLUBBER"), qint64(-1));
    QVERIFY(socket->getChar(c));
@ -2439,19 +2439,19 @@ void tst_QTcpSocket::connectionRefused()

    QTcpSocket *socket = newSocket();
    QSignalSpy stateSpy(socket, SIGNAL(stateChanged(QAbstractSocket::SocketState)));
-    QSignalSpy errorSpy(socket, SIGNAL(error(QAbstractSocket::SocketError)));
-    connect(socket, SIGNAL(error(QAbstractSocket::SocketError)),
+    QSignalSpy errorSpy(socket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)));
+    connect(socket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)),
            &QTestEventLoop::instance(), SLOT(exitLoop()));

    socket->connectToHost(QtNetworkSettings::httpServerName(), 144);

    enterLoop(10);
-    disconnect(socket, SIGNAL(error(QAbstractSocket::SocketError)),
+    disconnect(socket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)),
               &QTestEventLoop::instance(), SLOT(exitLoop()));
    QVERIFY2(!timeout(), "Network timeout");

    QCOMPARE(socket->state(), QAbstractSocket::UnconnectedState);
-    QCOMPARE(socket->socketError(), QAbstractSocket::ConnectionRefusedError);
+    QCOMPARE(socket->error(), QAbstractSocket::ConnectionRefusedError);

    QCOMPARE(stateSpy.count(), 3);
    QCOMPARE(qvariant_cast<QAbstractSocket::SocketState>(stateSpy.at(0).at(0)), QAbstractSocket::HostLookupState);
@ -2574,7 +2574,7 @@ void tst_QTcpSocket::connectToMultiIP()
    socket->connectToHost("multi.dev.qt-project.org", 81);
    QVERIFY(!socket->waitForConnected(2000));
    QVERIFY(stopWatch.elapsed() < 2000);
-    QCOMPARE(socket->socketError(), QAbstractSocket::SocketTimeoutError);
+    QCOMPARE(socket->error(), QAbstractSocket::SocketTimeoutError);

    delete socket;
 #endif
@ -2760,7 +2760,7 @@ void tst_QTcpSocket::taskQtBug5799ConnectionErrorWaitForConnected()
    socket.waitForConnected(10000);
    QVERIFY2(timer.elapsed() < 9900, "Connection to closed port timed out instead of refusing, something is wrong");
    QVERIFY2(socket.state() == QAbstractSocket::UnconnectedState, "Socket connected unexpectedly!");
-    QVERIFY2(socket.socketError() == QAbstractSocket::ConnectionRefusedError,
+    QVERIFY2(socket.error() == QAbstractSocket::ConnectionRefusedError,
             QString("Could not reach server: %1").arg(socket.errorString()).toLocal8Bit());
 }

@ -2773,13 +2773,13 @@ void tst_QTcpSocket::taskQtBug5799ConnectionErrorEventLoop()
    // check that we get a proper error connecting to port 12346
    // This testcase uses an event loop
    QTcpSocket socket;
-    connect(&socket, SIGNAL(error(QAbstractSocket::SocketError)), &QTestEventLoop::instance(), SLOT(exitLoop()));
+    connect(&socket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)), &QTestEventLoop::instance(), SLOT(exitLoop()));
    socket.connectToHost(QtNetworkSettings::httpServerName(), 12346);

    QTestEventLoop::instance().enterLoop(10);
    QVERIFY2(!QTestEventLoop::instance().timeout(), "Connection to closed port timed out instead of refusing, something is wrong");
    QVERIFY2(socket.state() == QAbstractSocket::UnconnectedState, "Socket connected unexpectedly!");
-    QVERIFY2(socket.socketError() == QAbstractSocket::ConnectionRefusedError,
+    QVERIFY2(socket.error() == QAbstractSocket::ConnectionRefusedError,
             QString("Could not reach server: %1").arg(socket.errorString()).toLocal8Bit());
 }

@ -2789,12 +2789,12 @@ void tst_QTcpSocket::taskQtBug7054TimeoutErrorResetting()

    socket->connectToHost(QtNetworkSettings::httpServerName(), 443);
    QVERIFY(socket->waitForConnected(5*1000));
-    QCOMPARE(socket->socketError(), QAbstractSocket::UnknownSocketError);
+    QCOMPARE(socket->error(), QAbstractSocket::UnknownSocketError);

    // We connected to the HTTPS port. Wait two seconds to receive data. We will receive
    // nothing because we would need to start the SSL handshake
    QVERIFY(!socket->waitForReadyRead(2*1000));
-    QCOMPARE(socket->socketError(), QAbstractSocket::SocketTimeoutError);
+    QCOMPARE(socket->error(), QAbstractSocket::SocketTimeoutError);

    // Now write some crap to make the server disconnect us. 4 lines are enough.
    socket->write("a\r\nb\r\nc\r\nd\r\n");
@ -2804,7 +2804,7 @@ void tst_QTcpSocket::taskQtBug7054TimeoutErrorResetting()
    // should get a better error since the server disconnected us
    QVERIFY(!socket->waitForReadyRead(2*1000));
    // It must NOT be the SocketTimeoutError that had been set before
-    QCOMPARE(socket->socketError(), QAbstractSocket::RemoteHostClosedError);
+    QCOMPARE(socket->error(), QAbstractSocket::RemoteHostClosedError);
 }

 #ifndef QT_NO_NETWORKPROXY
@ -2862,7 +2862,7 @@ void tst_QTcpSocket::invalidProxy()

    // note: the following test is not a hard failure.
    // Sometimes, error codes change for the better
-    QTEST(int(socket->socketError()), "expectedError");
+    QTEST(int(socket->error()), "expectedError");

    delete socket;
 }
@ -2982,7 +2982,7 @@ void tst_QTcpSocket::proxyFactory()

    // note: the following test is not a hard failure.
    // Sometimes, error codes change for the better
-    QTEST(int(socket->socketError()), "expectedError");
+    QTEST(int(socket->error()), "expectedError");

    delete socket;
 }
@ -3209,7 +3209,7 @@ void tst_QTcpSocket::readNotificationsAfterBind()
    QAbstractSocket socket(QAbstractSocket::TcpSocket, nullptr);
    QVERIFY2(socket.bind(), "Bind error!");

-    connect(&socket, SIGNAL(error(QAbstractSocket::SocketError)), &QTestEventLoop::instance(), SLOT(exitLoop()));
+    connect(&socket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)), &QTestEventLoop::instance(), SLOT(exitLoop()));
    QSignalSpy spyReadyRead(&socket, SIGNAL(readyRead()));
    socket.connectToHost(QtNetworkSettings::serverName(), 12346);

--- a/tests/auto/network/socket/qudpsocket/tst_qudpsocket.cpp
+++ b/tests/auto/network/socket/qudpsocket/tst_qudpsocket.cpp
@ -337,7 +337,7 @@ void tst_QUdpSocket::constructing()
    QCOMPARE(socket.canReadLine(), false);
    QCOMPARE(socket.readLine(), QByteArray());
    QCOMPARE(socket.socketDescriptor(), (qintptr)-1);
-    QCOMPARE(socket.socketError(), QUdpSocket::UnknownSocketError);
+    QCOMPARE(socket.error(), QUdpSocket::UnknownSocketError);
    QCOMPARE(socket.errorString(), QString("Unknown error"));

    // Check the state of the socket api
@ -575,7 +575,7 @@ void tst_QUdpSocket::ipv6Loop()
    int paulPort;

    if (!peter.bind(QHostAddress(QHostAddress::LocalHostIPv6), 0)) {
-        QCOMPARE(peter.socketError(), QUdpSocket::UnsupportedSocketOperationError);
+        QCOMPARE(peter.error(), QUdpSocket::UnsupportedSocketOperationError);
        return;
    }

@ -883,7 +883,7 @@ void tst_QUdpSocket::writeDatagram()
    qRegisterMetaType<QAbstractSocket::SocketError>("QAbstractSocket::SocketError");

    for(int i=0;;i++) {
-        QSignalSpy errorspy(&client, SIGNAL(error(QAbstractSocket::SocketError)));
+        QSignalSpy errorspy(&client, SIGNAL(errorOccurred(QAbstractSocket::SocketError)));
        QSignalSpy bytesspy(&client, SIGNAL(bytesWritten(qint64)));

        qint64 written = client.writeDatagram(QByteArray(i * 1024, 'w'), serverAddress,
@ -897,7 +897,7 @@ void tst_QUdpSocket::writeDatagram()
            QCOMPARE(errorspy.count(), 1);
            QCOMPARE(*static_cast<const int *>(errorspy.at(0).at(0).constData()),
                    int(QUdpSocket::DatagramTooLargeError));
-            QCOMPARE(client.socketError(), QUdpSocket::DatagramTooLargeError);
+            QCOMPARE(client.error(), QUdpSocket::DatagramTooLargeError);
            break;
        }
        QCOMPARE(bytesspy.count(), 1);
@ -1044,7 +1044,7 @@ void tst_QUdpSocket::writeToNonExistingPeer()

    QUdpSocket sConnected;
    QSignalSpy sConnectedReadyReadSpy(&sConnected, SIGNAL(readyRead()));
-    QSignalSpy sConnectedErrorSpy(&sConnected, SIGNAL(error(QAbstractSocket::SocketError)));
+    QSignalSpy sConnectedErrorSpy(&sConnected, SIGNAL(errorOccurred(QAbstractSocket::SocketError)));
    sConnected.connectToHost(peerAddress, peerPort, QIODevice::ReadWrite);
    QVERIFY(sConnected.waitForConnected(10000));

@ -1054,14 +1054,14 @@ void tst_QUdpSocket::writeToNonExistingPeer()
    // the second one should fail!
    QTest::qSleep(1000);                   // do not process events
    QCOMPARE(sConnected.write("", 1), qint64(-1));
-    QCOMPARE(int(sConnected.socketError()), int(QUdpSocket::ConnectionRefusedError));
+    QCOMPARE(int(sConnected.error()), int(QUdpSocket::ConnectionRefusedError));

    // the third one will succeed...
    QCOMPARE(sConnected.write("", 1), qint64(1));
    QTestEventLoop::instance().enterLoop(1);
    QCOMPARE(sConnectedReadyReadSpy.count(), 0);
    QCOMPARE(sConnectedErrorSpy.count(), 1);
-    QCOMPARE(int(sConnected.socketError()), int(QUdpSocket::ConnectionRefusedError));
+    QCOMPARE(int(sConnected.error()), int(QUdpSocket::ConnectionRefusedError));

    // we should now get a read error
    QCOMPARE(sConnected.write("", 1), qint64(1));
@ -1071,12 +1071,12 @@ void tst_QUdpSocket::writeToNonExistingPeer()
    QCOMPARE(sConnected.bytesAvailable(), Q_INT64_C(0));
    QCOMPARE(sConnected.pendingDatagramSize(), Q_INT64_C(-1));
    QCOMPARE(sConnected.readDatagram(buf, 2), Q_INT64_C(-1));
-    QCOMPARE(int(sConnected.socketError()), int(QUdpSocket::ConnectionRefusedError));
+    QCOMPARE(int(sConnected.error()), int(QUdpSocket::ConnectionRefusedError));

    QCOMPARE(sConnected.write("", 1), qint64(1));
    QTest::qSleep(1000);                   // do not process events
    QCOMPARE(sConnected.read(buf, 2), Q_INT64_C(0));
-    QCOMPARE(int(sConnected.socketError()), int(QUdpSocket::ConnectionRefusedError));
+    QCOMPARE(int(sConnected.error()), int(QUdpSocket::ConnectionRefusedError));

    // we should still be connected
    QCOMPARE(int(sConnected.state()), int(QUdpSocket::ConnectedState));
--- a/tests/auto/network/ssl/qocsp/tst_qocsp.cpp
+++ b/tests/auto/network/ssl/qocsp/tst_qocsp.cpp
@ -409,7 +409,7 @@ private:

    static QString certDirPath;

-    void (QSslSocket::*socketErrorSignal)(QAbstractSocket::SocketError) = &QAbstractSocket::error;
+    void (QSslSocket::*socketErrorSignal)(QAbstractSocket::SocketError) = &QAbstractSocket::errorOccurred;
    void (QSslSocket::*tlsErrorsSignal)(const QList<QSslError> &) = &QSslSocket::sslErrors;
    void (QTestEventLoop::*exitLoopSlot)() = &QTestEventLoop::exitLoop;

@ -605,7 +605,7 @@ void tst_QOcsp::malformedResponse()
    loop.enterLoopMSecs(handshakeTimeoutMS);

    QVERIFY(!clientSocket.isEncrypted());
-    QCOMPARE(clientSocket.socketError(), QAbstractSocket::SslHandshakeFailedError);
+    QCOMPARE(clientSocket.error(), QAbstractSocket::SslHandshakeFailedError);
 }

 void tst_QOcsp::expiredResponse_data()
--- a/tests/auto/network/ssl/qsslsocket/tst_qsslsocket.cpp
+++ b/tests/auto/network/ssl/qsslsocket/tst_qsslsocket.cpp
@ -533,7 +533,7 @@ void tst_QSslSocket::constructing()
    QCOMPARE(socket.write(0, 0), qint64(-1));
    QTest::ignoreMessage(QtWarningMsg, writeNotOpenMessage);
    QCOMPARE(socket.write(QByteArray()), qint64(-1));
-    QCOMPARE(socket.socketError(), QAbstractSocket::UnknownSocketError);
+    QCOMPARE(socket.error(), QAbstractSocket::UnknownSocketError);
    QVERIFY(!socket.flush());
    QVERIFY(!socket.isValid());
    QCOMPARE(socket.localAddress(), QHostAddress());
@ -1229,7 +1229,7 @@ protected:
        configuration.setProtocol(protocol);
        if (ignoreSslErrors)
            connect(socket, SIGNAL(sslErrors(QList<QSslError>)), this, SLOT(ignoreErrorSlot()));
-        connect(socket, SIGNAL(error(QAbstractSocket::SocketError)), this, SIGNAL(socketError(QAbstractSocket::SocketError)));
+        connect(socket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)), this, SIGNAL(socketError(QAbstractSocket::SocketError)));
        connect(socket, &QSslSocket::alertReceived, this, &SslServer::gotAlert);
        connect(socket, &QSslSocket::alertSent, this, &SslServer::alertSent);

@ -1360,8 +1360,8 @@ void tst_QSslSocket::protocolServerSide()
    socket = &client;
    QFETCH(QSsl::SslProtocol, clientProtocol);
    socket->setProtocol(clientProtocol);
-    // upon SSL wrong version error, error will be triggered, not sslErrors
-    connect(socket, SIGNAL(error(QAbstractSocket::SocketError)), &loop, SLOT(quit()));
+    // upon SSL wrong version error, errorOccurred will be triggered, not sslErrors
+    connect(socket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)), &loop, SLOT(quit()));
    connect(socket, SIGNAL(sslErrors(QList<QSslError>)), this, SLOT(ignoreErrorSlot()));
    connect(socket, SIGNAL(encrypted()), &loop, SLOT(quit()));

@ -1373,16 +1373,16 @@ void tst_QSslSocket::protocolServerSide()
    QAbstractSocket::SocketState expectedState = (works) ? QAbstractSocket::ConnectedState : QAbstractSocket::UnconnectedState;
    // Determine whether the client or the server caused the event loop
    // to quit due to a socket error, and investigate the culprit.
-    if (client.socketError() != QAbstractSocket::UnknownSocketError) {
+    if (client.error() != QAbstractSocket::UnknownSocketError) {
        // It can happen that the client, after TCP connection established, before
        // incomingConnection() slot fired, hits TLS initialization error and stops
        // the loop, so the server socket is not created yet.
        if (server.socket)
-            QVERIFY(server.socket->socketError() == QAbstractSocket::UnknownSocketError);
+            QVERIFY(server.socket->error() == QAbstractSocket::UnknownSocketError);

        QCOMPARE(client.state(), expectedState);
-    } else if (server.socket->socketError() != QAbstractSocket::UnknownSocketError) {
-        QVERIFY(client.socketError() == QAbstractSocket::UnknownSocketError);
+    } else if (server.socket->error() != QAbstractSocket::UnknownSocketError) {
+        QVERIFY(client.error() == QAbstractSocket::UnknownSocketError);
        QCOMPARE(server.socket->state(), expectedState);
    }

@ -1421,8 +1421,8 @@ void tst_QSslSocket::serverCipherPreferences()
        sslConfig.setCiphers({QSslCipher("AES256-SHA"), QSslCipher("AES128-SHA")});
        socket->setSslConfiguration(sslConfig);

-        // upon SSL wrong version error, error will be triggered, not sslErrors
-        connect(socket, SIGNAL(error(QAbstractSocket::SocketError)), &loop, SLOT(quit()));
+        // upon SSL wrong version error, errorOccurred will be triggered, not sslErrors
+        connect(socket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)), &loop, SLOT(quit()));
        connect(socket, SIGNAL(sslErrors(QList<QSslError>)), this, SLOT(ignoreErrorSlot()));
        connect(socket, SIGNAL(encrypted()), &loop, SLOT(quit()));

@ -1453,8 +1453,8 @@ void tst_QSslSocket::serverCipherPreferences()
        sslConfig.setCiphers({QSslCipher("AES256-SHA"), QSslCipher("AES128-SHA")});
        socket->setSslConfiguration(sslConfig);

-        // upon SSL wrong version error, error will be triggered, not sslErrors
-        connect(socket, SIGNAL(error(QAbstractSocket::SocketError)), &loop, SLOT(quit()));
+        // upon SSL wrong version error, errorOccurred will be triggered, not sslErrors
+        connect(socket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)), &loop, SLOT(quit()));
        connect(socket, SIGNAL(sslErrors(QList<QSslError>)), this, SLOT(ignoreErrorSlot()));
        connect(socket, SIGNAL(encrypted()), &loop, SLOT(quit()));

@ -1544,7 +1544,7 @@ void tst_QSslSocket::setLocalCertificateChain()
    const QScopedPointer<QSslSocket, QScopedPointerDeleteLater> client(new QSslSocket);
    socket = client.data();
    connect(socket, SIGNAL(encrypted()), &loop, SLOT(quit()));
-    connect(socket, SIGNAL(error(QAbstractSocket::SocketError)), &loop, SLOT(quit()));
+    connect(socket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)), &loop, SLOT(quit()));
    connect(socket, SIGNAL(sslErrors(QList<QSslError>)), this, SLOT(ignoreErrorSlot()));

    socket->connectToHostEncrypted(QHostAddress(QHostAddress::LocalHost).toString(), server.serverPort());
@ -1994,7 +1994,7 @@ void tst_QSslSocket::setEmptyKey()
    QTestEventLoop::instance().enterLoop(2);

    QCOMPARE(socket.state(), QAbstractSocket::ConnectedState);
-    QCOMPARE(socket.socketError(), QAbstractSocket::UnknownSocketError);
+    QCOMPARE(socket.error(), QAbstractSocket::UnknownSocketError);
 }

 void tst_QSslSocket::spontaneousWrite()
@ -2534,8 +2534,8 @@ void tst_QSslSocket::closeWhileEmittingSocketError()
    clientConfig.setPeerVerifyMode(QSslSocket::VerifyNone);
    clientSocket.setSslConfiguration(clientConfig);

-    QSignalSpy socketErrorSpy(&clientSocket, SIGNAL(error(QAbstractSocket::SocketError)));
-    void (QSslSocket::*errorSignal)(QAbstractSocket::SocketError) = &QSslSocket::error;
+    QSignalSpy socketErrorSpy(&clientSocket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)));
+    void (QSslSocket::*errorSignal)(QAbstractSocket::SocketError) = &QSslSocket::errorOccurred;
    connect(&clientSocket, errorSignal, &handshake, &BrokenPskHandshake::socketError);

    clientSocket.connectToHostEncrypted(QStringLiteral("127.0.0.1"), handshake.serverPort());
@ -2635,7 +2635,7 @@ void tst_QSslSocket::ignoreSslErrorsList()
    socket.ignoreSslErrors(expectedSslErrors);

    QFETCH(int, expectedSslErrorSignalCount);
-    QSignalSpy sslErrorsSpy(&socket, SIGNAL(error(QAbstractSocket::SocketError)));
+    QSignalSpy sslErrorsSpy(&socket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)));

    socket.connectToHostEncrypted(QtNetworkSettings::httpServerName(), 443);

@ -2766,11 +2766,11 @@ void tst_QSslSocket::writeBigChunk()
    // no better way to do this right now since the error is the same as the default error.
    if (socket->errorString().startsWith(QLatin1String("Unable to write data")))
    {
-        qWarning() << socket->socketError() << socket->errorString();
+        qWarning() << socket->error() << socket->errorString();
        QFAIL("Error while writing! Check if the OpenSSL BIO size is limited?!");
    }
    // also check the error string. If another error (than UnknownError) occurred, it should be different than before
-    QVERIFY2(errorBefore == errorAfter || socket->socketError() == QAbstractSocket::RemoteHostClosedError,
+    QVERIFY2(errorBefore == errorAfter || socket->error() == QAbstractSocket::RemoteHostClosedError,
             QByteArray("unexpected error: ").append(qPrintable(errorAfter)));

    // check that everything has been written to OpenSSL
@ -2929,13 +2929,13 @@ void tst_QSslSocket::resume()

    QSignalSpy sslErrorSpy(&socket, SIGNAL(sslErrors(QList<QSslError>)));
    QSignalSpy encryptedSpy(&socket, SIGNAL(encrypted()));
-    QSignalSpy errorSpy(&socket, SIGNAL(error(QAbstractSocket::SocketError)));
+    QSignalSpy errorSpy(&socket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)));

    connect(&socket, SIGNAL(sslErrors(QList<QSslError>)), &QTestEventLoop::instance(), SLOT(exitLoop()));
    connect(&socket, SIGNAL(encrypted()), &QTestEventLoop::instance(), SLOT(exitLoop()));
    connect(&socket, SIGNAL(proxyAuthenticationRequired(QNetworkProxy,QAuthenticator*)),
            this, SLOT(proxyAuthenticationRequired(QNetworkProxy,QAuthenticator*)));
-    connect(&socket, SIGNAL(error(QAbstractSocket::SocketError)), &QTestEventLoop::instance(), SLOT(exitLoop()));
+    connect(&socket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)), &QTestEventLoop::instance(), SLOT(exitLoop()));

    socket.connectToHostEncrypted(QtNetworkSettings::imapServerName(), 993);
    QTestEventLoop::instance().enterLoop(10);
@ -2965,7 +2965,7 @@ void tst_QSslSocket::resume()
        QCOMPARE(encryptedSpy.count(), 0);
        QVERIFY(!socket.isEncrypted());
        QCOMPARE(errorSpy.count(), 1);
-        QCOMPARE(socket.socketError(), QAbstractSocket::SslHandshakeFailedError);
+        QCOMPARE(socket.error(), QAbstractSocket::SslHandshakeFailedError);
    }
 }

@ -3246,7 +3246,7 @@ void tst_QSslSocket::dhServer()

    QSslSocket client;
    socket = &client;
-    connect(socket, SIGNAL(error(QAbstractSocket::SocketError)), &loop, SLOT(quit()));
+    connect(socket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)), &loop, SLOT(quit()));
    connect(socket, SIGNAL(sslErrors(QList<QSslError>)), this, SLOT(ignoreErrorSlot()));
    connect(socket, SIGNAL(encrypted()), &loop, SLOT(quit()));

@ -3280,7 +3280,7 @@ void tst_QSslSocket::dhServerCustomParamsNull()

    QSslSocket client;
    socket = &client;
-    connect(socket, SIGNAL(error(QAbstractSocket::SocketError)), &loop, SLOT(quit()));
+    connect(socket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)), &loop, SLOT(quit()));
    connect(socket, SIGNAL(sslErrors(QList<QSslError>)), this, SLOT(ignoreErrorSlot()));
    connect(socket, SIGNAL(encrypted()), &loop, SLOT(quit()));

@ -3325,7 +3325,7 @@ void tst_QSslSocket::dhServerCustomParams()

    QSslSocket client;
    socket = &client;
-    connect(socket, SIGNAL(error(QAbstractSocket::SocketError)), &loop, SLOT(quit()));
+    connect(socket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)), &loop, SLOT(quit()));
    connect(socket, SIGNAL(sslErrors(QList<QSslError>)), this, SLOT(ignoreErrorSlot()));
    connect(socket, SIGNAL(encrypted()), &loop, SLOT(quit()));

@ -3360,7 +3360,7 @@ void tst_QSslSocket::ecdhServer()

    QSslSocket client;
    socket = &client;
-    connect(socket, SIGNAL(error(QAbstractSocket::SocketError)), &loop, SLOT(quit()));
+    connect(socket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)), &loop, SLOT(quit()));
    connect(socket, SIGNAL(sslErrors(QList<QSslError>)), this, SLOT(ignoreErrorSlot()));
    connect(socket, SIGNAL(encrypted()), &loop, SLOT(quit()));

@ -3552,7 +3552,7 @@ void tst_QSslSocket::readBufferMaxSize()

    QSslSocketPtr client(new QSslSocket);
    socket = client.data();
-    connect(socket, SIGNAL(error(QAbstractSocket::SocketError)), &loop, SLOT(quit()));
+    connect(socket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)), &loop, SLOT(quit()));
    connect(socket, SIGNAL(sslErrors(QList<QSslError>)), this, SLOT(ignoreErrorSlot()));
    connect(socket, SIGNAL(encrypted()), &loop, SLOT(quit()));

@ -3813,7 +3813,7 @@ void tst_QSslSocket::simplePskConnect()
    QSignalSpy sslErrorsSpy(&socket, SIGNAL(sslErrors(QList<QSslError>)));
    QVERIFY(sslErrorsSpy.isValid());

-    QSignalSpy socketErrorsSpy(&socket, SIGNAL(error(QAbstractSocket::SocketError)));
+    QSignalSpy socketErrorsSpy(&socket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)));
    QVERIFY(socketErrorsSpy.isValid());

    QSignalSpy peerVerifyErrorSpy(&socket, SIGNAL(peerVerifyError(QSslError)));
@ -3827,7 +3827,7 @@ void tst_QSslSocket::simplePskConnect()
    connect(&socket, SIGNAL(modeChanged(QSslSocket::SslMode)), this, SLOT(exitLoop()));
    connect(&socket, SIGNAL(encrypted()), this, SLOT(exitLoop()));
    connect(&socket, SIGNAL(sslErrors(QList<QSslError>)), this, SLOT(exitLoop()));
-    connect(&socket, SIGNAL(error(QAbstractSocket::SocketError)), this, SLOT(exitLoop()));
+    connect(&socket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)), this, SLOT(exitLoop()));
    connect(&socket, SIGNAL(peerVerifyError(QSslError)), this, SLOT(exitLoop()));
    connect(&socket, SIGNAL(stateChanged(QAbstractSocket::SocketState)), this, SLOT(exitLoop()));

@ -4095,7 +4095,7 @@ void tst_QSslSocket::pskServer()
    connect(&socket, SIGNAL(modeChanged(QSslSocket::SslMode)), this, SLOT(exitLoop()));
    connect(&socket, SIGNAL(encrypted()), this, SLOT(exitLoop()));
    connect(&socket, SIGNAL(sslErrors(QList<QSslError>)), this, SLOT(exitLoop()));
-    connect(&socket, SIGNAL(error(QAbstractSocket::SocketError)), this, SLOT(exitLoop()));
+    connect(&socket, SIGNAL(errorOccurred(QAbstractSocket::SocketError)), this, SLOT(exitLoop()));
    connect(&socket, SIGNAL(peerVerifyError(QSslError)), this, SLOT(exitLoop()));
    connect(&socket, SIGNAL(stateChanged(QAbstractSocket::SocketState)), this, SLOT(exitLoop()));

@ -4275,7 +4275,7 @@ void tst_QSslSocket::signatureAlgorithm()

    QEventLoop loop;
    QTimer::singleShot(5000, &loop, &QEventLoop::quit);
-    connect(socket, QOverload<QAbstractSocket::SocketError>::of(&QAbstractSocket::error), &loop, &QEventLoop::quit);
+    connect(socket, &QAbstractSocket::errorOccurred, &loop, &QEventLoop::quit);
    connect(socket, QOverload<const QList<QSslError> &>::of(&QSslSocket::sslErrors), this, &tst_QSslSocket::ignoreErrorSlot);
    connect(socket, &QSslSocket::encrypted, &loop, &QEventLoop::quit);

@ -4333,9 +4333,9 @@ void tst_QSslSocket::unsupportedProtocols()
        // early, preventing any real connection from ever starting.
        QSslSocket socket;
        socket.setProtocol(unsupportedProtocol);
-        QCOMPARE(socket.socketError(), QAbstractSocket::UnknownSocketError);
+        QCOMPARE(socket.error(), QAbstractSocket::UnknownSocketError);
        socket.connectToHostEncrypted(QStringLiteral("doesnotmatter.org"), 1010);
-        QCOMPARE(socket.socketError(), QAbstractSocket::SslInvalidUserDataError);
+        QCOMPARE(socket.error(), QAbstractSocket::SslInvalidUserDataError);
        QCOMPARE(socket.state(), QAbstractSocket::UnconnectedState);
    }
    {
@ -4345,14 +4345,14 @@ void tst_QSslSocket::unsupportedProtocols()
        QVERIFY(server.listen());

        QSslSocket socket;
-        QCOMPARE(socket.socketError(), QAbstractSocket::UnknownSocketError);
+        QCOMPARE(socket.error(), QAbstractSocket::UnknownSocketError);

        socket.connectToHost(QHostAddress::LocalHost, server.serverPort());
        QVERIFY(socket.waitForConnected(timeoutMS));

        socket.setProtocol(unsupportedProtocol);
        socket.startClientEncryption();
-        QCOMPARE(socket.socketError(), QAbstractSocket::SslInvalidUserDataError);
+        QCOMPARE(socket.error(), QAbstractSocket::SslInvalidUserDataError);
    }
    {
        // 2. waitForEncrypted: client-side, blocking API plus requires from us
@ -4376,7 +4376,7 @@ void tst_QSslSocket::unsupportedProtocols()
        loop.enterLoopMSecs(timeoutMS);
        QVERIFY(!loop.timeout());
        QVERIFY(server.socket);
-        QCOMPARE(server.socket->socketError(), QAbstractSocket::SslInvalidUserDataError);
+        QCOMPARE(server.socket->error(), QAbstractSocket::SslInvalidUserDataError);
    }
 }

--- a/tests/auto/other/networkselftest/tst_networkselftest.cpp
+++ b/tests/auto/other/networkselftest/tst_networkselftest.cpp
@ -428,7 +428,7 @@ void tst_NetworkSelfTest::serverReachability()
    QVERIFY2(timer.elapsed() < 9900, "Connection to closed port timed out instead of refusing, something is wrong");

    QVERIFY2(socket.state() == QAbstractSocket::UnconnectedState, "Socket connected unexpectedly!");
-    QVERIFY2(socket.socketError() == QAbstractSocket::ConnectionRefusedError,
+    QVERIFY2(socket.error() == QAbstractSocket::ConnectionRefusedError,
             QString("Could not reach server: %1").arg(socket.errorString()).toLocal8Bit());
 }

@ -458,7 +458,7 @@ void tst_NetworkSelfTest::remotePortsOpen()
    socket.connectToHost(QtNetworkSettings::serverName(), portNumber);

    if (!socket.waitForConnected(10000)) {
-        if (socket.socketError() == QAbstractSocket::SocketTimeoutError)
+        if (socket.error() == QAbstractSocket::SocketTimeoutError)
            QFAIL(QString("Network timeout connecting to the server on port %1").arg(portNumber).toLocal8Bit());
        else
            QFAIL(QString("Error connecting to server on port %1: %2").arg(portNumber).arg(socket.errorString()).toLocal8Bit());
--- a/tests/auto/widgets/dialogs/qwizard/tst_qwizard.cpp
+++ b/tests/auto/widgets/dialogs/qwizard/tst_qwizard.cpp
@ -586,7 +586,7 @@ void tst_QWizard::addPage()
 #define CHECK_VISITED(wizard, list) \
    do { \
        QList<int> myList = list; \
-        QCOMPARE((wizard).visitedPages(), myList); \
+        QCOMPARE((wizard).visitedIds(), myList); \
        Q_FOREACH(int id, myList) \
            QVERIFY((wizard).hasVisitedPage(id)); \
    } while (0)
@ -2293,7 +2293,7 @@ void tst_QWizard::removePage()

    wizard.restart();
    QCOMPARE(wizard.pageIds().size(), 4);
-    QCOMPARE(wizard.visitedPages().size(), 1);
+    QCOMPARE(wizard.visitedIds().size(), 1);
    QCOMPARE(spy.count(), 0);

    // Removing a non-existent page
@ -2331,14 +2331,14 @@ void tst_QWizard::removePage()
    wizard.setPage(2, page2); // restore
    wizard.restart();
    wizard.next();
-    QCOMPARE(wizard.visitedPages().size(), 2);
+    QCOMPARE(wizard.visitedIds().size(), 2);
    QCOMPARE(wizard.currentPage(), page1);
    QCOMPARE(spy.count(), 0);
    wizard.removePage(2);
    QCOMPARE(spy.count(), 1);
    arguments = spy.takeFirst();
    QCOMPARE(arguments.at(0).toInt(), 2);
-    QCOMPARE(wizard.visitedPages().size(), 2);
+    QCOMPARE(wizard.visitedIds().size(), 2);
    QVERIFY(!wizard.pageIds().contains(2));
    QCOMPARE(wizard.currentPage(), page1);

@ -2347,14 +2347,14 @@ void tst_QWizard::removePage()
    wizard.restart();
    wizard.next();
    QCOMPARE(spy.count(), 0);
-    QCOMPARE(wizard.visitedPages().size(), 2);
+    QCOMPARE(wizard.visitedIds().size(), 2);
    QCOMPARE(wizard.currentPage(), page1);
    wizard.removePage(0);
    QCOMPARE(spy.count(), 1);
    arguments = spy.takeFirst();
    QCOMPARE(arguments.at(0).toInt(), 0);
-    QCOMPARE(wizard.visitedPages().size(), 1);
-    QVERIFY(!wizard.visitedPages().contains(0));
+    QCOMPARE(wizard.visitedIds().size(), 1);
+    QVERIFY(!wizard.visitedIds().contains(0));
    QVERIFY(!wizard.pageIds().contains(0));
    QCOMPARE(wizard.currentPage(), page1);

@ -2363,14 +2363,14 @@ void tst_QWizard::removePage()
    wizard.restart();
    wizard.next();
    QCOMPARE(spy.count(), 0);
-    QCOMPARE(wizard.visitedPages().size(), 2);
+    QCOMPARE(wizard.visitedIds().size(), 2);
    QCOMPARE(wizard.currentPage(), page1);
    wizard.removePage(1);
    QCOMPARE(spy.count(), 1);
    arguments = spy.takeFirst();
    QCOMPARE(arguments.at(0).toInt(), 1);
-    QCOMPARE(wizard.visitedPages().size(), 1);
-    QVERIFY(!wizard.visitedPages().contains(1));
+    QCOMPARE(wizard.visitedIds().size(), 1);
+    QVERIFY(!wizard.visitedIds().contains(1));
    QVERIFY(!wizard.pageIds().contains(1));
    QCOMPARE(wizard.currentPage(), page0);

@ -2379,8 +2379,8 @@ void tst_QWizard::removePage()
    QCOMPARE(spy.count(), 1);
    arguments = spy.takeFirst();
    QCOMPARE(arguments.at(0).toInt(), 0);
-    QCOMPARE(wizard.visitedPages().size(), 1);
-    QVERIFY(!wizard.visitedPages().contains(0));
+    QCOMPARE(wizard.visitedIds().size(), 1);
+    QVERIFY(!wizard.visitedIds().contains(0));
    QCOMPARE(wizard.pageIds().size(), 2);
    QVERIFY(!wizard.pageIds().contains(0));
    QCOMPARE(wizard.currentPage(), page2);
@ -2389,8 +2389,8 @@ void tst_QWizard::removePage()
    QCOMPARE(spy.count(), 1);
    arguments = spy.takeFirst();
    QCOMPARE(arguments.at(0).toInt(), 2);
-    QCOMPARE(wizard.visitedPages().size(), 1);
-    QVERIFY(!wizard.visitedPages().contains(2));
+    QCOMPARE(wizard.visitedIds().size(), 1);
+    QVERIFY(!wizard.visitedIds().contains(2));
    QCOMPARE(wizard.pageIds().size(), 1);
    QVERIFY(!wizard.pageIds().contains(2));
    QCOMPARE(wizard.currentPage(), page3);
@ -2399,7 +2399,7 @@ void tst_QWizard::removePage()
    QCOMPARE(spy.count(), 1);
    arguments = spy.takeFirst();
    QCOMPARE(arguments.at(0).toInt(), 3);
-    QVERIFY(wizard.visitedPages().empty());
+    QVERIFY(wizard.visitedIds().empty());
    QVERIFY(wizard.pageIds().empty());
    QCOMPARE(wizard.currentPage(), nullptr);
 }
--- a/tests/auto/widgets/kernel/qwidget/BLACKLIST
+++ b/tests/auto/widgets/kernel/qwidget/BLACKLIST
@ -8,11 +8,6 @@ b2qt
 opensuse-42.3
 [restoreVersion1Geometry]
 ubuntu-16.04
-[updateWhileMinimized]
-ubuntu-18.04
-rhel-7.4
-ubuntu-16.04
-rhel-7.6
 [focusProxyAndInputMethods]
 rhel-7.6
 opensuse-leap
--- a/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp
+++ b/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp
@ -8074,7 +8074,17 @@ void tst_QWidget::updateWhileMinimized()
    QTest::qWait(10);
    if (m_platform == QStringLiteral("winrt"))
        QEXPECT_FAIL("", "WinRT: This fails. QTBUG-68297.", Abort);
-    QCOMPARE(widget.numPaintEvents, 0);
+    int count = 0;
+    // mutter/GNOME Shell doesn't unmap when minimizing window.
+    // More details at https://gitlab.gnome.org/GNOME/mutter/issues/185
+    if (m_platform == QStringLiteral("xcb")) {
+        const QString desktop = qgetenv("XDG_CURRENT_DESKTOP");
+        qDebug() << "xcb: XDG_CURRENT_DESKTOP=" << desktop;
+        if (desktop == QStringLiteral("ubuntu:GNOME")
+            || desktop == QStringLiteral("GNOME-Classic:GNOME"))
+            count = 1;
+    }
+    QCOMPARE(widget.numPaintEvents, count);

    // Restore window.
    widget.showNormal();
--- a/Show More
+++ b/Show More