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qt5base-lts/dist/changes-5.0.0
Thiago Macieira 75a0c7f9b5 [SIC] Make non-const the QRegExp methods that modify the internals 
These methods modify QRegExp internals and should not have been
const. It's actually dangerous to have them const, since users may
think it's safe to use the matching method in a thread-safe manner.

Task-number: QTBUG-25064
Change-Id: Ia370eb42fd0407a94924f420297c5e83d3908214
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>
2012-04-28 19:42:51 +02:00

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Some of the changes listed in this file include issue tracking numbers
corresponding to tasks in the Qt Bug Tracker:
http://bugreports.qt-project.org/
Each of these identifiers can be entered in the bug tracker to obtain more
information about a particular change.
****************************************************************************
* Source incompatible changes *
****************************************************************************
- QSslCertificate::subjectInfo() and QSslCertificate::issuerInfo() now
return a QStringList instead of a QString
- QSslCertificate::isValid() has been deprecated. Originally it only checked
the certificate dates, but later checking for blacklisting was added. Now
there's a more specific QSslCertificate::isBlacklisted() method.
- Unite clipping support has been removed from QPainter. The alternative is
to unite QRegion's and using the result on QPainter.
- QLibrary::resolve() now returns a function pointer instead of a void
pointer.
- QSslCertificate::alternateSubjectNames() is deprecated (but can be enabled
via QT_DISABLE_DEPRECATED_BEFORE), use
QSslCertificate::subjectAlternativeNames() instead.
- QLibraryInfo::buildKey() has been removed. Likewise, the QT_BUILD_KEY
preprocessor #define has also been removed. The build-key is obsolete
and is no longer necessary.
- QCoreApplication::translate() will no longer return the source text when
the translation is empty. Use lrelease -removeidentical for optimization.
- QString and QByteArray constructors that take a size argument will now treat
negative sizes to indicate nul-terminated strings (a nul-terminated array of
QChar, in the case of QString). In Qt 4, negative sizes were ignored and
result in empty QString and QByteArray, respectively. The size argument to
those constructors now has a default value of -1, thus replacing the separate
constructors that did the same.
- Qt::escape() is deprecated (but can be enabled via
QT_DISABLE_DEPRECATED_BEFORE), use QString::toHtmlEscaped() instead.
- QBool is gone. QString::contains, QByteArray::contains, and QList::contains
used to return an internal QBool class so that the Qt3 code
"if (a.contains() == 2)" wouldn't compile anymore. Such code cannot exist
in Qt4, so these methods return a bool now. If your code used the undocumented
QBool, simply replace it with bool.
- qIsDetached<> has been removed without replacement.
- QMetaType:
* QMetaType::construct() has been renamed to QMetaType::create().
* QMetaType::unregisterType() has been removed.
- QMetaMethod:
* QMetaMethod::signature() has been renamed to QMetaMethod::methodSignature(),
and the return type has been changed to QByteArray. This was done to be able
to generate the signature string on demand, rather than always storing it in
the meta-data.
* QMetaMethod::typeName() no longer returns an empty string when the return
type is void; it returns "void". The recommended way of checking whether a
method returns void is to compare the return value of QMetaMethod::returnType()
to QMetaType::Void.
- QTestLib:
* The plain-text, xml and lightxml test output formats have been changed to
show a test result for every row of test data in data-driven tests. In
Qt4, only fails and skips were shown for individual data rows and passes
were not shown for individual data rows, preventing accurate calculation
of test run rates and pass rates.
* The QTRY_VERIFY and QTRY_COMPARE macros have been moved into QTestLib.
These macros formerly lived in tests/shared/util.h but are now provided
by including the <QtTest/QtTest> header. In addition,
QTRY_VERIFY_WITH_TIMEOUT and QTRY_COMPARE_WITH_TIMEOUT are provided,
allowing for specifying custom timeout values.
* The QTEST_NOOP_MAIN macro has been removed from the API. If a test is
known at compile-time to be inapplicable for a particular build it should
be omitted via .pro file logic, or the test should call QSKIP in the
initTestCase() method to skip the entire test and report a meaningful
explanation in the test log.
* The DEPENDS_ON macro has been removed from the API. This macro did nothing
and misled some users to believe that they could make test functions depend
on each other or impose an execution order on test functions.
* The QTest::qt_snprintf function has been removed from the API. This was an
internal testlib function that was exposed in the public API due to its use
in a public macro. Any calls to this function should be replaced by a call
to qsnprintf(), which comes from the <QtCore/QByteArray> header.
* The QTest::pixmapsAreEqual() function has been removed from the API.
Comparison of QPixmap objects should be done using QCOMPARE, which provides
more informative output in the event of a failure.
* The QSKIP macro no longer has the "mode" parameter, which caused problems
for calculating test metrics, as the SkipAll mode hid information about
what test data was skipped. Calling QSKIP in a test function now behaves
like SkipSingle -- skipping a non-data-driven test function or skipping
only the current data row of a data-driven test function. Every skipped
data row is now reported in the test log.
- The QSsl::TlsV1 enum value was renamed to QSsl::TlsV1_0 .
- QAccessible:
* Internal QAccessible::State enum value HasInvokeExtension removed
- QAccessibleInterface:
* The "child" integer parameters have been removed. This moves the api
to be closer to IAccessible2.
This means several functions lose their integer parameter:
text(Text t, int child) -> text(Text t), rect(int child) -> rect()
setText(Text t, int child, const QString &text) -> setText(Text t, const QString &text)
role(int child) -> role(), state(int child) -> state()
* parent() and child() was added in order to do hierarchical navigation.
* relations() was added as a replacement to relationTo()
* As a consequence of the above two points, navigate() was removed.
* Accessible-Action related functions have been removed. QAccessibleInterface
subclasses are expected to implement the QAccessibleActionInterface instead.
These functions have been removed:
QAccessibleInterface::userActionCount, QAccessibleInterface::actionText,
QAccessibleInterface::doAction
- QAccessibleEvent also loses the child parameter.
QAccessibleEvent(Type type, int child) -> QAccessibleEvent(Type type)
QAccessibleEvent::child() removed.
- QAccessibleActionInterface:
* Refactored to be based on action names. All functions have been changed from using
int parameters to strings.
- QSound has been moved from QtGui to QtMultimedia
- QTabletEvent::QTabletEvent does not take a hiResGlobalPos argument anymore,
as all coordinates are floating point based now.
- QTouchEvent:
* The DeviceType enum and deviceType() have been deprecated due to
the introduction of QTouchDevice.
* The signature of the constructor has changed. It now takes a
QTouchDevice pointer instead of just a DeviceType value.
* TouchPointState no longer includes TouchPointStateMask and
TouchPointPrimary. QTouchEvent::TouchPoint::isPrimary() has
been removed.
* QWidget *widget() has been removed and is replaced by QObject
*target() in order to avoid QWidget dependencies.
* QEvent::TouchCancel has been introduced. On systems where it makes
sense this event type can be used to differentiate between a
regular TouchEnd and abrupt touch sequence cancellations caused by
the compositor, for example when a system gesture gets recognized.
- QMetaType
* Q_DECLARE_METATYPE(Foo*) now requires that Foo is fully defined. In
cases where a forward declared type should be used as a metatype,
Q_DECLARE_OPAQUE_POINTER(Foo*) can be used to allow that.
- QItemEditorFactory
* The signature of the createEditor and valuePropertyName methods
have been changed to take arguments of type int instead of QVariant::Type.
- QWindowSystemInterface:
* The signature of all handleTouchEvent() variants have changed,
taking a QTouchDevice* instead of just a DeviceType value.
Platform or generic plug-ins have to create and register at least
one QTouchDevice before sending the first touch event.
* The event type parameter is removed from handleTouchEvent().
- The previously exported function qt_translateRawTouchEvent() has been removed.
Use QWindowSystemInterface::handleTouchEvent() instead.
- QAbstractEventDispatcher
* The signature for the pure-virtual registerTimer() has changed. Subclasses
of QAbstractEventDispatcher will need to be updated to reimplement the new
pure-virtual 'virtual void registerTimer(int timerId, int interval,
Qt::TimerType timerType, QObject *object) = 0;'
* QAbstractEventDispatcher::TimerInfo is no longer a QPair<int, int>. It is
now a struct with 3 members: struct TimerInfo { int timerId; int interval;
Qt::TimerType timerType; }; Reimplementations of
QAbstractEventDispatcher::registeredTimers() will need to be updated to pass
3 arguments to the TimerInfo constructor (instead of 2).
- QUuid
* Removed implicit conversion operator QUuid::operator QString(), instead
QUuid::toString() function should be used.
- The QHttp, QHttpHeader, QHttpResponseHeader and QHttpRequestHeader classes have
been removed, QNetworkAccessManager should be used instead.
- The QFtp class is no longer exported, QNetworkAccessManager should be used
instead.
- QProcess
* On Windows, QProcess::ForwardedChannels will not forward the output of GUI
applications anymore, if they do not create a console.
- QAbstractSocket's connectToHost() and disconnectFromHost() are now virtual and
connectToHostImplementation() and disconnectFromHostImplementation() don't exist.
- QTcpServer::incomingConnection() now takes a qintptr instead of an int.
- QNetworkConfiguration::bearerName() removed, and bearerTypeName() should be used.
- QDir::convertSeparators() (deprecated since Qt 4.2) has been removed. Use
QDir::toNativeSeparators() instead.
- QIconEngineV2 was merged into QIconEngine
You might need to adjust your code if it used a QIconEngine.
- qmake
* Projects which explicitly set an empty TARGET are considered broken now.
* The makespec and .qmake.cache do not see build pass specific variables any more.
* load()/include() with a target namespace and infile()/$$fromfile() now start with
an entirely pristine context.
* Configure's -sysroot and -hostprefix are now handled slightly differently.
The QT_INSTALL_... properties are now automatically prefixed with the sysroot;
the raw values are available as QT_INSTALL_.../raw and the sysroot as QT_SYSROOT.
The new QT_HOST_... properties can be used to refer to the Qt host tools.
* Several functions and built-in variables were modified to return normalized paths.
- QTextCodecPlugin has been removed since it is no longer used. All text codecs
are now built into QtCore.
- QDir::NoDotAndDotDot is QDir::NoDot|QDir::NoDotDot therefore there is no need
to use or check both.
- QFSFileEngine, QAbstractFileEngine, QAbstractFileEngineIterator and
QAbstractFileEngineHandler were removed from public API and are no longer
exported. They may temporarily live as private implementation details, but
they may be altogether dropped or otherwise changed at will in the future.
- QLocale
* toShort(), toUShort(), toInt(), toUInt(), toLongLong() and toULongLong() no
longer take a parameter for base, they will only perform localised base 10
conversions. For converting other bases use the QString methods instead.
- QSystemLocale has been removed from the public API.
- QSqlQueryModel::indexInQuery() is now virtual. See note below under QtSql.
- QSqlDriver::subscribeToNotification, unsubscribeFromNotification,
subscribedToNotifications, isIdentifierEscaped, and stripDelimiters
are now virtual. See note below under QtSql.
- qMacVersion() has been removed. Use QSysInfo::macVersion() or
QSysInfo::MacintoshVersion instead.
- QColorDialog::customColor() now returns a QColor value instead of QRgb.
QColorDialog::setCustomColor() and QColorDialog::setStandardColor() now
take a QColor value for their second parameter instead of QRgb.
****************************************************************************
* General *
****************************************************************************
General Improvements
--------------------
- The directory structure of the qtbase unit-tests has been reworked to
more closely match the directory structure of the code under test.
Integration tests have been moved to tests/auto/integrationtests.
Third party components
----------------------
-
****************************************************************************
* Library *
****************************************************************************
QtCore
------
* drop a bogus QChar::NoCategory enum value; the proper QChar::Other_NotAssigned
value is returned for an unassigned codepoints now.
* layoutAboutToBeChanged is no longer emitted by QAbstractItemModel::beginMoveRows.
layoutChanged is no longer emitted by QAbstractItemModel::endMoveRows. Proxy models
should now also connect to (and disconnect from) the rowsAboutToBeMoved and
rowsMoved signals.
* The default value of the property QSortFilterProxyModel::dynamicSortFilter was
changed from false to true.
* The signature of the virtual QAbstractItemView::dataChanged method has changed to
include the roles which have changed. The signature is consistent with the dataChanged
signal in the model.
* QFileSystemWatcher is now able to return failure in case of errors whilst
altering the watchlist in both the singular and QStringList overloads of
addPath and removePath.
* QString::mid, QString::midRef and QByteArray::mid, if the position passed
is equal to the length (that is, right after the last character/byte),
now return an empty QString, QStringRef or QByteArray respectively.
in Qt 4 they returned a null QString or a null QStringRef.
* QString methods toLongLong(), toULongLong(), toLong(), toULong(), toInt(),
toUInt(), toShort(), toUShort(), toDouble(), and toFloat() no longer use the
default or system locale, they will always use the C locale. This is to
guarantee consistent default conversion of strings. For locale-aware conversions
use the equivalent QLocale methods.
* QDate, QTime, and QDateTime have undergone important behavioural changes:
* QDate only implements the Gregorian calendar, the switch to the Julian
calendar before 1582 has been removed. This means all QDate methods will
return different results for dates prior to 15 October 1582, and there is
no longer a gap between 4 October 1582 and 15 October 1582.
* QDate::setYMD() is deprecated, use QDate::setDate() instead
* Most methods now apply strict validity checks and will return appropriate
and consistent values when invalid. For example, QDate::year() will return
0 and QDate::shortMonthName() will return QString().
* Adding days to a null QDate or seconds to a null QTime will no longer return
a valid QDate/QTime.
* QDate stores the Julian Day as a qint64 extending date support across a
more interesting range, see the class documentation for details.
* Conversion to YMD form dates is only accurate between to 4800 BCE to
1.4 million CE
* The QDate::addDays() and QDateTime::addDays() methods now take a qint64
* The QDate::daysTo() and QDateTime::daysTo() methods now return a qint64
* QTextCodec::codecForCStrings() and QTextCodec::setCodecForCStrings() have both
been removed. This was removed due to issues with breaking other code from
libraries, creating uncertainty/bugs in using QString easily, and (to a lesser
extent) performance issues.
* QTextCodec::codecForTr() and QTextCodec::setCodecForTr() have been removed,
QCoreApplication::Encoding value CodecForTr is now obsolete, use
DefaultCodec instead. For reasoning, see the codecForCStrings() removal above.
* QIntValidator and QDoubleValidator no longer fall back to using the C locale if
the requested locale fails to validate the input.
* A new set of classes for doing pattern matching with Perl-compatible regular
expressions has been added: QRegularExpression, QRegularExpressionMatch and
QRegularExpressionMatchIterator. They aim to replace QRegExp with a more
powerful and flexible regular expression engine.
* Certain methods in QRegExp that modified the object's internals are no longer marked
const. They were accidentally marked const in Qt 4 but the problem could not be
fixed. The following are suggestions to adapt code to this change:
- make sure the QRegExp object is not const in the given context
- create a copy of the QRegExp object before using it
- invert the operation and use QString. E.g., rx.indexIn(string) becomes string.indexOf(rx)
* QEvent::AccessibilityPrepare, AccessibilityHelp and AccessibilityDescription removed:
* The enum values simply didn't make sense in the first place and should simply be dropped.
* [QTBUG-23529] QHash is now more resilient to a family of denial of service
attacks exploiting algorithmic complexity, by supporting two-arguments overloads
of the qHash() hashing function.
QtGui
-----
* Accessibility has been refactored. The hierachy of accessible objects is implemented via
proper parent/child functions instead of using navigate which has been deprecated for this purpose.
Table and cell interfaces have been added to qaccessible2.h
* Touch events and points have been extended to hold additional
information like capability flags, point-specific flags, velocity,
and raw positions.
* A new set of enabler classes have been added, most importantly QWindow, QScreen,
QSurfaceFormat, and QOpenGLContext.
* Most of the useful QtOpenGL classes have been polished and moved into
QtGui. See QOpenGLFramebufferObject, QOpenGLShaderProgram,
QOpenGLFunctions, etc.
* QOpenGLPaintDevice has been added to be able to use QPainter to render into
the currently bound context.
QtWidgets
---------
* QInputContext removed as well as related getters and setters on QWidget and QApplication.
Input contexts are now platform specific.
* QInputDialog::getInteger() has been obsoleted. Use QInputDialog::getInt() instead.
* In Qt 4, many QStyleOption subclasses were introduced in order to keep
binary compatibility -- QStyleOption was designed to be extended this way,
in fact it embeds a version number. In Qt 5 the various QStyleOption*V{2,3,4}
classes have been removed, and their members merged into the respective
base classes. Those classes were left as typedefs to keep existing code
working. Still, some minor adjustements could be necessary, especially in code
that uses QStyleOption directly and does not initialize all the members using
the proper Qt API: due to the version bump, QStyle will try to use the additional
QStyleOption members, which are left default-initialized.
* QHeaderView - The following functions have been obsoleted.
* void setMovable(bool movable) - use void setSectionsMovable(bool movable) instead.
* bool isMovable() const - use bool sectionsMovable() const instead.
* void setClickable(bool clickable) - use void setSectionsClickable(bool clickable) instead.
* bool isClickable() const - use bool sectionsClickable() instead.
* void setResizeMode(int logicalindex, ResizeMode mode) -
use setSectionResizeMode(logicalindex, mode) instead.
* ResizeMode resizeMode(int logicalindex) const -
use sectionResizeMode(int logicalindex) instead.
* QDateEdit and QTimeEdit have re-gained a USER property. These were originally removed
before Qt 4.7.0, and are re-added for 5.0. This means that the userProperty for
those classes are now QDate and QTime respectively, not QDateTime as they have been
for the 4.7 and 4.8 releases.
QtNetwork
---------
* QHostAddress::isLoopback() API added. Returns true if the address is
one of the IP loopback addresses.
* QSslCertificate::serialNumber() now always returns the serial number in
hexadecimal format.
* The openssl network backend now reads the ssl configuration file allowing
the use of openssl engines.
QtDBus
------
* QtDBus now generates property annotations for the Qt type names
in the org.qtproject.QtDBus namespace. When parsing such annotations
both the old and new namespaces are accepted.
* QtDBus error codes have been updated to be on the org.qtproject.QtDBus.Error
namespace.
QtOpenGL
--------
* Most of the classes in this module (with the notable exception of QGLWidget)
now have equivalents in QtGui, along with the naming change QGL -> QOpenGL.
The classes in QtOpenGL that have equivalents in QtGui can now be considered
deprecated.
QtScript
--------
QTestLib
--------
* [QTBUG-20615] Autotests can now log test output to multiple destinations
and log formats simultaneously.
QtSql
-----
QSqlQueryModel/QSqlTableModel/QSqlRelationalTableModel
* The dataChanged() signal is now emitted for changes made to an inserted
record that has not yet been committed. Previously, dataChanged() was
suppressed in this case for OnRowChange and OnFieldChange. This was probably
an attempt to avoid trouble if setData() was called while handling
primeInsert(). By emitting dataChanged(), we ensure that all views are aware
of the change.
* While handling primeInsert() signal, the record must be manipulated using
the provided reference. Do not attempt to manipulate the records using the
model methods setData() or setRecord().
* removeRows() no longer emits extra beforeDelete signal for out of range row.
* removeRows() now requires the whole range of targetted rows to be valid
before doing anything. Previously, it would remove what it could and
ignore the rest of the range.
* removeRows(), for OnFieldChange and OnRowChange, allows only 1 row to be
removed and only if there are no other changed rows.
* setRecord() and insertRecord()
-Only use fields where generated flag is set to true. This is
is consistent with the meaning of the flag.
-Require all fields to map correctly. Previously fields that didn't
map were simply ignored.
-For OnManualSubmit, insertRecord() no longer leaves behind an empty
row if setRecord() fails.
-setRecord() now automatically submits for OnRowChange.
* QSqlQueryModel::indexInQuery() is now virtual. See
QSqlTableModel::indexInQuery() as example of how to implement in a
subclass.
* QSqlQueryMode::setQuery() emits fewer signals. The modelAboutToBeReset()
and modelReset() signals suffice to inform views that they must reinterrogate
the model.
* QSqlTableModel::selectRow(): This is a new method that refreshes a single
row in the model from the database.
* QSqlTableModel edit strategies OnFieldChange/OnRowChange QTBUG-2875
Previously, after changes were submitted in these edit strategies, select()
was called which removed and inserted all rows. This ruined navigation
in QTableView. Now, with these edit strategies, there is no implicit select()
done after committing. This includes deleted rows which remain in
the model as blank rows until the application calls select(). Instead,
selectRow() is called to refresh only the affected row.
* QSqlTableModel::isDirty(): New overloaded method to check whether model
has any changes to submit. QTBUG-3108
* QSqlTableModel::setData() and setRecord() no longer revert pending changes
that fail upon resubmitting for edit strategies OnFieldChange and OnRowChange.
Instead, pending (failed) changes cause new changes inappropriate to the
edit strategy to be refused. The application should resolve or revert pending
changes. insertRows() and insertRecord() also respect the edit strategy.
* QSqlTableModel::setData() and setRecord() in OnRowChange no longer have the
side effect of submitting the cached row when invoked on a different row.
* QSqlDriver::subscribeToNotification, unsubscribeFromNotification,
subscribedToNotifications, isIdentifierEscaped, and stripDelimiters
are now virtual. Their xxxImplemenation counterparts have been removed
now that QSqlDriver subclasses can reimplement these directly.
****************************************************************************
* Database Drivers *
****************************************************************************
sqlite
------
* QVariant::Bool type now mapped to integers 0/1 in SQL instead of strings
'true' and 'false'. Sqlite does not have a boolean column type and it is
customary to use integer. QTBUG-23895
****************************************************************************
* Platform Specific Changes *
****************************************************************************
Qt for Linux/X11
----------------
Qt for Windows
--------------
* Accessibility framework uses IAccessible2
Qt for Mac OS X
---------------
Qt for Embedded Linux
---------------------
Qt for Windows CE
-----------------
****************************************************************************
* Compiler Specific Changes *
****************************************************************************
****************************************************************************
* Tools *
****************************************************************************
- Build System
* Remove qttest_p4.prf file. From now on we should explicitly enable the
things from it which we want. Autotest .pro files should stop using
'load(qttest_p4)' and start using 'CONFIG+=testcase' instead.
- Assistant
- Designer
* [QTBUG-8926] [QTBUG-20440] Properties of type QStringList now have
translation attributes which apply to all items.
They are by default translatable.
- Linguist
- rcc
- moc
* [QTBUG-20785] The moc now has a -b<file> option to #include an additional
file at the beginning of the generated file.
- uic
- uic3
- qmake
* QMAKE_MOC_OPTIONS variable is now available for passing additional parameters
to the moc.
- configure
- qtconfig
****************************************************************************
* Plugins *
****************************************************************************
- The text codecs that were previously plugins are now built into QtCore.
****************************************************************************
* Important Behavior Changes *
****************************************************************************
- QPointer
* The implementation of QPointer has been changed to use QWeakPointer. The
old guard mechanism has been removed. This causes a slight change
in behavior when using QPointer:
* When using QPointer on a QWidget (or a subclass of QWidget), previously
the QPointer would be cleared by the QWidget destructor. Now, the QPointer
is cleared by the QObject destructor (since this is when QWeakPointers are
cleared). Any QPointers tracking a widget will NOT be cleared before the
QWidget destructor destroys the children for the widget being tracked.
- QUrl
* QUrl has been changed to operate only on percent-encoded
forms. Fully-decoded forms, where the percent character stands for itself,
are no longer possible. For that reason, the getters and setters with
"encoded" in the name are deprecated, except for QUrl::toEncoded() and
QUrl::fromEncoded().
QUrl now operates in a mode where it decodes as much as it can of the
percent-encoding sequences. In addition, the setter methods possess a mode
in which a '%' character not part of a percent-encoding sequence will cause
the parser to correct the input. Therefore, most software will not require
changes to adapt, since the getter methods will continue returning the
components in their most-decoded form as they did before and the setter
methods will accept input as they did before..
The most notable difference is when dealing with
QUrl::toString(). Previously, this function would return percent characters
in the URL by themselves. Now, it will return "%25", like
QUrl::toEncoded().
- QVariant
* Definition of QVariant::UserType changed. Currently it is the same as
QMetaType::User, which means that it points to the first registered custom
type, instead of a nonexistent type.
- QMetaType
* Interpretation of QMetaType::Void was changed. Before, in some cases
it was returned as an invalid type id, but sometimes it was used as a valid
type (C++ "void"). In Qt5, new QMetaType::UnknownType was introduced to
distinguish between these two. QMetaType::UnknownType is an invalid type id
signaling that a type is unknown to QMetaType, and QMetaType::Void
is a valid type id of C++ void type. The difference will be visible for
example in call to QMetaType::typeName(), this function will return null for
QMetaType::UnknownType and a pointer to "void" string for
QMetaType::Void.
Please, notice that QMetaType::UnknownType has value 0, which previously was
reserved for QMetaType::Void.
- QMessageBox
* The static function QMessageBox::question has changed the default argument
for buttons. Before the default was to have an Ok button. That is changed
to having a yes and a no button.
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