diff --git a/src/corelib/kernel/qobject.cpp b/src/corelib/kernel/qobject.cpp
index efa71470d4..b0e2ebca92 100644
--- a/src/corelib/kernel/qobject.cpp
+++ b/src/corelib/kernel/qobject.cpp
@@ -4497,6 +4497,14 @@ QDebug operator<<(QDebug dbg, const QObject *o)
     \c{staticMetaObject} is of type QMetaObject and provides access to the
     enums declared with Q_ENUM_NS/Q_FLAG_NS.
 
+    For example:
+
+    \code
+    namespace test {
+    Q_NAMESPACE
+    ...
+    \endcode
+
     \sa Q_NAMESPACE_EXPORT
 */
 
@@ -4513,6 +4521,14 @@ QDebug operator<<(QDebug dbg, const QObject *o)
     is declared with the supplied \a EXPORT_MACRO qualifier. This is
     useful if the object needs to be exported from a dynamic library.
 
+    For example:
+
+    \code
+    namespace test {
+    Q_NAMESPACE_EXPORT(EXPORT_MACRO)
+    ...
+    \endcode
+
     \sa Q_NAMESPACE, {Creating Shared Libraries}
 */
 
diff --git a/src/corelib/text/qstringliteral.h b/src/corelib/text/qstringliteral.h
index 742d38de7d..913a8b0ee8 100644
--- a/src/corelib/text/qstringliteral.h
+++ b/src/corelib/text/qstringliteral.h
@@ -1,7 +1,7 @@
 /****************************************************************************
 **
 ** Copyright (C) 2016 The Qt Company Ltd.
-** Copyright (C) 2016 Intel Corporation.
+** Copyright (C) 2020 Intel Corporation.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the QtCore module of the Qt Toolkit.
diff --git a/src/corelib/time/qdatetime.cpp b/src/corelib/time/qdatetime.cpp
index c2f0601ebf..eb4beff9e6 100644
--- a/src/corelib/time/qdatetime.cpp
+++ b/src/corelib/time/qdatetime.cpp
@@ -2631,7 +2631,6 @@ QT_WARNING_POP
     \row \li ap or a
          \li Interpret as an am/pm time. \e a/ap will match a lower-case version
              of either QLocale::amText() or QLocale::pmText().
-    \row \li t \li the timezone (for example "CEST")
     \endtable
 
     All other input characters will be treated as text. Any non-empty sequence
@@ -5554,8 +5553,15 @@ QT_WARNING_POP
 
     Uses the calendar \a cal if supplied, else Gregorian.
 
-    See QDate::fromString() and QTime::fromString() for the expressions
-    recognized in the format string to represent parts of the date and time.
+    In addition to the expressions, recognized in the format string to represent
+    parts of the date and time, by QDate::fromString() and QTime::fromString(),
+    this method supports:
+
+    \table
+    \header \li Expression \li Output
+    \row \li t \li the timezone (for example "CEST")
+    \endtable
+
     All other input characters will be treated as text. Any non-empty sequence
     of characters enclosed in single quotes will also be treated (stripped of
     the quotes) as text and not be interpreted as expressions.
diff --git a/src/corelib/time/qdatetimeparser.cpp b/src/corelib/time/qdatetimeparser.cpp
index 3374b28b69..bc3d9b992e 100644
--- a/src/corelib/time/qdatetimeparser.cpp
+++ b/src/corelib/time/qdatetimeparser.cpp
@@ -525,7 +525,7 @@ bool QDateTimeParser::parseFormat(const QString &newFormat)
                 }
                 break;
             case 't':
-                if (parserType != QMetaType::QTime) {
+                if (parserType == QMetaType::QDateTime) {
                     const SectionNode sn = { TimeZoneSection, i - add, countRepeat(newFormat, i, 4), 0 };
                     newSectionNodes.append(sn);
                     appendSeparator(&newSeparators, newFormat, index, i - index, lastQuote);
diff --git a/src/gui/image/qimage.cpp b/src/gui/image/qimage.cpp
index 189f12fd5c..5460104fd0 100644
--- a/src/gui/image/qimage.cpp
+++ b/src/gui/image/qimage.cpp
@@ -2122,12 +2122,7 @@ static QImage convertWithPalette(const QImage &src, QImage::Format format,
     QImage dest(src.size(), format);
     dest.setColorTable(clut);
 
-    QString textsKeys = src.text();
-    const auto textKeyList = textsKeys.splitRef(QLatin1Char('\n'), Qt::SkipEmptyParts);
-    for (const auto &textKey : textKeyList) {
-        const auto textKeySplitted = textKey.split(QLatin1String(": "));
-        dest.setText(textKeySplitted[0].toString(), textKeySplitted[1].toString());
-    }
+    QImageData::get(dest)->text = QImageData::get(src)->text;
 
     int h = src.height();
     int w = src.width();
diff --git a/src/gui/image/qimage.h b/src/gui/image/qimage.h
index df8d2729ef..138a52ab78 100644
--- a/src/gui/image/qimage.h
+++ b/src/gui/image/qimage.h
@@ -320,6 +320,7 @@ private:
     friend class QRasterPlatformPixmap;
     friend class QBlittablePlatformPixmap;
     friend class QPixmapCacheEntry;
+    friend struct QImageData;
 
 public:
     typedef QImageData * DataPtr;
diff --git a/src/gui/image/qimage_p.h b/src/gui/image/qimage_p.h
index 6f6f626858..e154ae8183 100644
--- a/src/gui/image/qimage_p.h
+++ b/src/gui/image/qimage_p.h
@@ -69,6 +69,9 @@ struct Q_GUI_EXPORT QImageData {        // internal image data
     static QImageData *create(const QSize &size, QImage::Format format);
     static QImageData *create(uchar *data, int w, int h,  qsizetype bpl, QImage::Format format, bool readOnly, QImageCleanupFunction cleanupFunction = nullptr, void *cleanupInfo = nullptr);
 
+    static QImageData *get(QImage &img) noexcept { return img.d; }
+    static const QImageData *get(const QImage &img) noexcept { return img.d; }
+
     QAtomicInt ref;
 
     int width;
diff --git a/src/plugins/platforms/cocoa/qcocoabackingstore.mm b/src/plugins/platforms/cocoa/qcocoabackingstore.mm
index c734be09b6..97bb4e8bed 100644
--- a/src/plugins/platforms/cocoa/qcocoabackingstore.mm
+++ b/src/plugins/platforms/cocoa/qcocoabackingstore.mm
@@ -536,8 +536,10 @@ void QCALayerBackingStore::flush(QWindow *flushedWindow, const QRegion &region,
         flushedView.layer.contentsScale = m_buffers.back()->devicePixelRatio();
     }
 
+    const bool isSingleBuffered = window()->format().swapBehavior() == QSurfaceFormat::SingleBuffer;
+
     id backBufferSurface = (__bridge id)m_buffers.back()->surface();
-    if (flushedView.layer.contents == backBufferSurface) {
+    if (!isSingleBuffered && flushedView.layer.contents == backBufferSurface) {
         // We've managed to paint to the back buffer again before Core Animation had time
         // to flush the transaction and persist the layer changes to the window server, or
         // we've been asked to flush without painting anything. The layer already knows about
@@ -554,7 +556,7 @@ void QCALayerBackingStore::flush(QWindow *flushedWindow, const QRegion &region,
     // with other pending view and layer updates.
     flushedView.window.viewsNeedDisplay = YES;
 
-    if (window()->format().swapBehavior() == QSurfaceFormat::SingleBuffer) {
+    if (isSingleBuffered) {
         // The private API [CALayer reloadValueForKeyPath:@"contents"] would be preferable,
         // but barring any side effects or performance issues we opt for the hammer for now.
         flushedView.layer.contents = nil;