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

 Conflicts:
	src/widgets/kernel/qshortcut.cpp
	tests/auto/network/access/spdy/tst_spdy.cpp

Change-Id: If76c434beac2c0a393440aa365f89f77439774ce

33 files changed, 548 insertions, 475 deletions

diff --git a/src/corelib/doc/src/dontdocument.qdoc b/src/corelib/doc/src/dontdocument.qdoc
index d7859a45af..5fe05997cc 100644
--- a/src/corelib/doc/src/dontdocument.qdoc
+++ b/src/corelib/doc/src/dontdocument.qdoc
@@ -37,5 +37,5 @@
                  QCborValueRef qfloat16 QDeferredDeleteEvent QSpecialInteger QLittleEndianStorageType
                  QBigEndianStorageType QFactoryInterface QFutureWatcherBase QJsonValuePtr
                  QJsonValueRefPtr QLinkedListNode QAbstractConcatenable QStringBuilderCommon
-                 QTextCodec::ConverterState QThreadStorageData)
+                 QTextCodec::ConverterState QThreadStorageData QTextStreamManipulator)
 */
diff --git a/src/corelib/global/qglobal.h b/src/corelib/global/qglobal.h
index d508716024..c1fcc12cfb 100644
--- a/src/corelib/global/qglobal.h
+++ b/src/corelib/global/qglobal.h
@@ -893,7 +893,7 @@ QT_WARNING_POP
 #endif
 
 QT_WARNING_PUSH
-// warning: noexcept-expression evaluates to ‘false’ because of a call to ‘void swap(..., ...)'
+// warning: noexcept-expression evaluates to 'false' because of a call to 'void swap(..., ...)'
 QT_WARNING_DISABLE_GCC("-Wnoexcept")
 
 namespace QtPrivate
diff --git a/src/corelib/global/qnumeric_p.h b/src/corelib/global/qnumeric_p.h
index 376da66e31..7a03e32699 100644
--- a/src/corelib/global/qnumeric_p.h
+++ b/src/corelib/global/qnumeric_p.h
@@ -253,7 +253,8 @@ QT_WARNING_POP
 // size_t. Implementations for 8- and 16-bit types will work but may not be as
 // efficient. Implementations for 64-bit may be missing on 32-bit platforms.
 
-#if (defined(Q_CC_GNU) && (Q_CC_GNU >= 500) || (defined(Q_CC_INTEL) && !defined(Q_OS_WIN))) || __has_builtin(__builtin_add_overflow)
+#if ((defined(Q_CC_INTEL) ? (Q_CC_INTEL >= 1800 && !defined(Q_OS_WIN)) : defined(Q_CC_GNU)) \
+     && Q_CC_GNU >= 500) || __has_builtin(__builtin_add_overflow)
 // GCC 5, ICC 18, and Clang 3.8 have builtins to detect overflows
 
 template <typename T> inline
diff --git a/src/corelib/io/qprocess.cpp b/src/corelib/io/qprocess.cpp
index 816026a36c..aedcae2cdc 100644
--- a/src/corelib/io/qprocess.cpp
+++ b/src/corelib/io/qprocess.cpp
@@ -1004,7 +1004,7 @@ QT_WARNING_POP
 
 /*!
     \internal
-    Returns true if we emitted readyRead().
+    Returns \c true if we emitted readyRead().
 */
 bool QProcessPrivate::tryReadFromChannel(Channel *channel)
 {
@@ -2187,6 +2187,8 @@ bool QProcess::startDetached(qint64 *pid)
     This method is an alias for start(), and exists only to fully implement
     the interface defined by QIODevice.
 
+    Returns \c true if the program has been started.
+
     \sa start(), setProgram(), setArguments()
 */
 bool QProcess::open(OpenMode mode)
diff --git a/src/corelib/io/qresource.cpp b/src/corelib/io/qresource.cpp
index 0d75faa234..e636712e57 100644
--- a/src/corelib/io/qresource.cpp
+++ b/src/corelib/io/qresource.cpp
@@ -1,7 +1,7 @@
 /****************************************************************************
 **
-** Copyright (C) 2018 The Qt Company Ltd.
-** Copyright (C) 2019 Intel Corporation.
+** Copyright (C) 2019 The Qt Company Ltd.
+** Copyright (C) 2020 Intel Corporation.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the QtCore module of the Qt Toolkit.
@@ -60,14 +60,14 @@
 #include "private/qtools_p.h"
 #include "private/qsystemerror_p.h"
 
+#ifndef QT_NO_COMPRESS
+#  include <zconf.h>
+#  include <zlib.h>
+#endif
 #if QT_CONFIG(zstd)
 #  include <zstd.h>
 #endif
 
-#ifdef Q_OS_UNIX
-# include "private/qcore_unix_p.h"
-#endif
-
 #if defined(Q_OS_UNIX) && !defined(Q_OS_NACL) && !defined(Q_OS_INTEGRITY)
 #  define QT_USE_MMAP
 #  include <sys/mman.h>
@@ -296,6 +296,8 @@ public:
 
     void ensureInitialized() const;
     void ensureChildren() const;
+    qint64 uncompressedSize() const Q_DECL_PURE_FUNCTION;
+    qsizetype decompress(char *buffer, qsizetype bufferSize) const;
 
     bool load(const QString &file);
     void clear();
@@ -440,6 +442,78 @@ QResourcePrivate::ensureChildren() const
     }
 }
 
+qint64 QResourcePrivate::uncompressedSize() const
+{
+    switch (compressionAlgo) {
+    case QResource::NoCompression:
+        return size;
+
+    case QResource::ZlibCompression:
+#ifndef QT_NO_COMPRESS
+        if (size_t(size) >= sizeof(quint32))
+            return qFromBigEndian<quint32>(data);
+#else
+        Q_ASSERT(!"QResource: Qt built without support for Zlib compression");
+        Q_UNREACHABLE();
+#endif
+        break;
+
+    case QResource::ZstdCompression: {
+#if QT_CONFIG(zstd)
+        size_t n = ZSTD_getFrameContentSize(data, size);
+        return ZSTD_isError(n) ? -1 : qint64(n);
+#else
+        // This should not happen because we've refused to load such resource
+        Q_ASSERT(!"QResource: Qt built without support for Zstd compression");
+        Q_UNREACHABLE();
+#endif
+    }
+
+    }
+    return -1;
+}
+
+qsizetype QResourcePrivate::decompress(char *buffer, qsizetype bufferSize) const
+{
+    Q_ASSERT(data);
+
+    switch (compressionAlgo) {
+    case QResource::NoCompression:
+        Q_UNREACHABLE();
+        break;
+
+    case QResource::ZlibCompression: {
+#ifndef QT_NO_COMPRESS
+        uLong len = uLong(bufferSize);
+        int res = ::uncompress(reinterpret_cast<Bytef *>(buffer), &len,
+                               data + sizeof(quint32), uLong(size - sizeof(quint32)));
+        if (res != Z_OK) {
+            qWarning("QResource: error decompressing zlib content (%d)", res);
+            return -1;
+        }
+        return len;
+#else
+        Q_UNREACHABLE();
+#endif
+    }
+
+    case QResource::ZstdCompression: {
+#if QT_CONFIG(zstd)
+        size_t usize = ZSTD_decompress(buffer, bufferSize, data, size);
+        if (ZSTD_isError(usize)) {
+            qWarning("QResource: error decompressing zstd content: %s", ZSTD_getErrorName(usize));
+            return -1;
+        }
+        return usize;
+#else
+        Q_UNREACHABLE();
+#endif
+    }
+    }
+
+    return -1;
+}
+
 /*!
     Constructs a QResource pointing to \a file. \a locale is used to
     load a specific localization of a resource data.
@@ -600,9 +674,12 @@ QResource::Compression QResource::compressionAlgorithm() const
 }
 
 /*!
-    Returns the size of the data backing the resource.
+    Returns the size of the stored data backing the resource.
 
-    \sa data(), isFile()
+    If the resource is compressed, this function returns the size of the
+    compressed data. See uncompressedSize() for the uncompressed size.
+
+    \sa data(), uncompressedSize(), isFile()
 */
 
 qint64 QResource::size() const
@@ -613,12 +690,29 @@ qint64 QResource::size() const
 }
 
 /*!
-    Returns direct access to a read only segment of data that this resource
-    represents. If the resource is compressed the data returned is compressed
-    and the appropriate library functions must be used to access the data. If
-    the resource is a directory \nullptr is returned.
+    \since 5.15
+
+    Returns the size of the data in this resource. If the data was not
+    compressed, this function returns the same as size(). If it was, then this
+    function extracts the size of the original uncompressed data from the
+    stored stream.
 
-    \sa size(), compressionAlgorithm(), isFile()
+    \sa size(), uncompressedData(), isFile()
+*/
+qint64 QResource::uncompressedSize() const
+{
+    Q_D(const QResource);
+    d->ensureInitialized();
+    return d->uncompressedSize();
+}
+
+/*!
+    Returns direct access to a segment of read-only data, that this resource
+    represents. If the resource is compressed, the data returned is also
+    compressed. The caller must then decompress the data or use
+    uncompressedData(). If the resource is a directory, \c nullptr is returned.
+
+    \sa uncompressedData(), size(), isFile()
 */
 
 const uchar *QResource::data() const
@@ -629,6 +723,42 @@ const uchar *QResource::data() const
 }
 
 /*!
+    \since 5.15
+
+    Returns the resource data, decompressing it first, if the data was stored
+    compressed. If the resource is a directory or an error occurs while
+    decompressing, a null QByteArray is returned.
+
+    \note If the data was compressed, this function will decompress every time
+    it is called. The result is not cached between calls.
+
+    \sa uncompressedData(), size(), isCompressed(), isFile()
+*/
+
+QByteArray QResource::uncompressedData() const
+{
+    Q_D(const QResource);
+    qint64 n = uncompressedSize();
+    if (n < 0)
+        return QByteArray();
+    if (n > std::numeric_limits<QByteArray::size_type>::max()) {
+        qWarning("QResource: compressed content does not fit into a QByteArray; use QFile instead");
+        return QByteArray();
+    }
+    if (d->compressionAlgo == NoCompression)
+        return QByteArray::fromRawData(reinterpret_cast<const char *>(d->data), n);
+
+    // decompress
+    QByteArray result(n, Qt::Uninitialized);
+    n = d->decompress(result.data(), n);
+    if (n < 0)
+        result.clear();
+    else
+        result.truncate(n);
+    return result;
+}
+
+/*!
     \since 5.8
 
     Returns the date and time when the file was last modified before
@@ -1445,13 +1575,7 @@ bool QResourceFileEngine::link(const QString &)
 qint64 QResourceFileEngine::size() const
 {
     Q_D(const QResourceFileEngine);
-    if (!d->resource.isValid())
-        return 0;
-    if (d->resource.compressionAlgorithm() != QResource::NoCompression) {
-        d->uncompress();
-        return d->uncompressed.size();
-    }
-    return d->resource.size();
+    return d->resource.isValid() ? d->resource.uncompressedSize() : 0;
 }
 
 qint64 QResourceFileEngine::pos() const
@@ -1609,12 +1733,7 @@ uchar *QResourceFileEnginePrivate::map(qint64 offset, qint64 size, QFile::Memory
     Q_Q(QResourceFileEngine);
     Q_UNUSED(flags);
 
-    qint64 max = resource.size();
-    if (resource.compressionAlgorithm() != QResource::NoCompression) {
-        uncompress();
-        max = uncompressed.size();
-    }
-
+    qint64 max = resource.uncompressedSize();
     qint64 end;
     if (offset < 0 || size <= 0 || !resource.isValid() ||
             add_overflow(offset, size, &end) || end > max) {
@@ -1623,8 +1742,12 @@ uchar *QResourceFileEnginePrivate::map(qint64 offset, qint64 size, QFile::Memory
     }
 
     const uchar *address = resource.data();
-    if (resource.compressionAlgorithm() != QResource::NoCompression)
+    if (resource.compressionAlgorithm() != QResource::NoCompression) {
+        uncompress();
+        if (uncompressed.isNull())
+            return nullptr;
         address = reinterpret_cast<const uchar *>(uncompressed.constData());
+    }
 
     return const_cast<uchar *>(address) + offset;
 }
@@ -1637,41 +1760,10 @@ bool QResourceFileEnginePrivate::unmap(uchar *ptr)
 
 void QResourceFileEnginePrivate::uncompress() const
 {
-    if (uncompressed.isEmpty() && resource.size()) {
-        quint64 size;
-        switch (resource.compressionAlgorithm()) {
-        case QResource::NoCompression:
-            return;     // nothing to do
-
-        case QResource::ZlibCompression:
-#ifndef QT_NO_COMPRESS
-            uncompressed = qUncompress(resource.data(), resource.size());
-#else
-            Q_ASSERT(!"QResourceFileEngine::open: Qt built without support for Zlib compression");
-#endif
-            break;
-
-        case QResource::ZstdCompression:
-#if QT_CONFIG(zstd)
-            size = ZSTD_getFrameContentSize(resource.data(), resource.size());
-            if (!ZSTD_isError(size)) {
-                if (size >= MaxAllocSize) {
-                    qWarning("QResourceFileEngine::open: content bigger than memory (size %lld)", size);
-                } else {
-                    uncompressed = QByteArray(size, Qt::Uninitialized);
-                    size = ZSTD_decompress(const_cast<char *>(uncompressed.data()), size,
-                                           resource.data(), resource.size());
-                }
-            }
-            if (ZSTD_isError(size))
-                qWarning("QResourceFileEngine::open: error decoding: %s", ZSTD_getErrorName(size));
-#else
-            Q_UNUSED(size);
-            Q_ASSERT(!"QResourceFileEngine::open: Qt built without support for Zstd compression");
-#endif
-            break;
-        }
-    }
+    if (resource.compressionAlgorithm() == QResource::NoCompression
+            || !uncompressed.isEmpty() || resource.size() == 0)
+        return;     // nothing to do
+    uncompressed = resource.uncompressedData();
 }
 
 #endif // !defined(QT_BOOTSTRAPPED)
diff --git a/src/corelib/io/qresource.h b/src/corelib/io/qresource.h
index 5ee8d5d266..52b0d74d29 100644
--- a/src/corelib/io/qresource.h
+++ b/src/corelib/io/qresource.h
@@ -1,6 +1,7 @@
 /****************************************************************************
 **
-** Copyright (C) 2016 The Qt Company Ltd.
+** Copyright (C) 2019 The Qt Company Ltd.
+** Copyright (C) 2019 Intel Corporation.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the QtCore module of the Qt Toolkit.
@@ -75,6 +76,8 @@ public:
     Compression compressionAlgorithm() const;
     qint64 size() const;
     const uchar *data() const;
+    qint64 uncompressedSize() const;
+    QByteArray uncompressedData() const;
     QDateTime lastModified() const;
 
 #if QT_DEPRECATED_SINCE(5, 13)
diff --git a/src/corelib/itemmodels/qstringlistmodel.cpp b/src/corelib/itemmodels/qstringlistmodel.cpp
index 9c87ff853a..a950783ed8 100644
--- a/src/corelib/itemmodels/qstringlistmodel.cpp
+++ b/src/corelib/itemmodels/qstringlistmodel.cpp
@@ -212,6 +212,7 @@ Qt::ItemFlags QStringListModel::flags(const QModelIndex &index) const
     \a index in the model, to the provided \a value.
 
     The dataChanged() signal is emitted if the item is changed.
+    Returns \c true after emitting the dataChanged() signal.
 
     \sa Qt::ItemDataRole, data()
 */
@@ -249,6 +250,8 @@ bool QStringListModel::clearItemData(const QModelIndex &index)
     specified, indicating that the rows are inserted in the top level of
     the model.
 
+    Returns \c true if the insertion was successful.
+
     \sa QAbstractItemModel::insertRows()
 */
 
@@ -275,6 +278,8 @@ bool QStringListModel::insertRows(int row, int count, const QModelIndex &parent)
     specified, indicating that the rows are removed in the top level of
     the model.
 
+    Returns \c true if the row removal was successful.
+
     \sa QAbstractItemModel::removeRows()
 */
 
diff --git a/src/corelib/time/qdatetimeparser.cpp b/src/corelib/time/qdatetimeparser.cpp
index fa0884c827..31d8e6cc20 100644
--- a/src/corelib/time/qdatetimeparser.cpp
+++ b/src/corelib/time/qdatetimeparser.cpp
@@ -137,13 +137,12 @@ bool QDateTimeParser::setDigit(QDateTime &v, int index, int newVal) const
 #endif
         return false;
     }
-    const SectionNode &node = sectionNodes.at(index);
 
-    const QDate date = v.date();
+    QCalendar::YearMonthDay date = calendar.partsFromDate(v.date());
+    if (!date.isValid())
+        return false;
+
     const QTime time = v.time();
-    int year = date.year(calendar);
-    int month = date.month(calendar);
-    int day = date.day(calendar);
     int hour = time.hour();
     int minute = time.minute();
     int second = time.second();
@@ -152,14 +151,15 @@ bool QDateTimeParser::setDigit(QDateTime &v, int index, int newVal) const
     // Only offset from UTC is amenable to setting an int value:
     int offset = tspec == Qt::OffsetFromUTC ? v.offsetFromUtc() : 0;
 
+    const SectionNode &node = sectionNodes.at(index);
     switch (node.type) {
     case Hour24Section: case Hour12Section: hour = newVal; break;
     case MinuteSection: minute = newVal; break;
     case SecondSection: second = newVal; break;
     case MSecSection: msec = newVal; break;
     case YearSection2Digits:
-    case YearSection: year = newVal; break;
-    case MonthSection: month = newVal; break;
+    case YearSection: date.year = newVal; break;
+    case MonthSection: date.month = newVal; break;
     case DaySection:
     case DayOfWeekSectionShort:
     case DayOfWeekSectionLong:
@@ -169,7 +169,7 @@ bool QDateTimeParser::setDigit(QDateTime &v, int index, int newVal) const
             // to 31 for february should return true
             return false;
         }
-        day = newVal;
+        date.day = newVal;
         break;
     case TimeZoneSection:
         if (newVal < absoluteMin(index) || newVal > absoluteMax(index))
@@ -185,15 +185,14 @@ bool QDateTimeParser::setDigit(QDateTime &v, int index, int newVal) const
     }
 
     if (!(node.type & DaySectionMask)) {
-        if (day < cachedDay)
-            day = cachedDay;
-        const int max = calendar.daysInMonth(month, year);
-        if (day > max) {
-            day = max;
-        }
+        if (date.day < cachedDay)
+            date.day = cachedDay;
+        const int max = calendar.daysInMonth(date.month, date.year);
+        if (date.day > max)
+            date.day = max;
     }
 
-    const QDate newDate(year, month, day, calendar);
+    const QDate newDate = calendar.dateFromParts(date);
     const QTime newTime(hour, minute, second, msec);
     if (!newDate.isValid() || !newTime.isValid())
         return false;
diff --git a/src/corelib/tools/qline.cpp b/src/corelib/tools/qline.cpp
index 3afd23d76b..dde66ed093 100644
--- a/src/corelib/tools/qline.cpp
+++ b/src/corelib/tools/qline.cpp
@@ -374,7 +374,7 @@ QDataStream &operator>>(QDataStream &stream, QLine &line)
 */
 
 /*!
-    \enum QLineF::IntersectionType
+    \enum QLineF::IntersectType
 
     Describes the intersection between two lines.
 
diff --git a/src/corelib/tools/qscopeguard.qdoc b/src/corelib/tools/qscopeguard.qdoc
index 5a9b7fd210..6b3c942e84 100644
--- a/src/corelib/tools/qscopeguard.qdoc
+++ b/src/corelib/tools/qscopeguard.qdoc
@@ -51,10 +51,10 @@ QT_BEGIN_NAMESPACE
            of the scope.
     \ingroup misc
 
-    QScopeGuard<F> is a class which sole purpose is to run a function \e F in
-    its destructor. This is useful for guaranteeing your cleanup code is
-    executed, whether the function is exited normally, exited early by a return
-    statement, or exited by an exception.
+    QScopeGuard<F> is a class of which the sole purpose is to run the function
+    \a f in its destructor. This is useful for guaranteeing
+    your cleanup code is executed, whether the function is exited normally,
+    exited early by a return statement, or exited by an exception.
 
     If \e F is a lambda then you cannot instantiate the template directly,
     therefore the qScopeGuard() helper is provided and QScopeGuard<F> is made a
diff --git a/src/corelib/tools/qsharedpointer.cpp b/src/corelib/tools/qsharedpointer.cpp
index f185d2f23f..0576fb2bd0 100644
--- a/src/corelib/tools/qsharedpointer.cpp
+++ b/src/corelib/tools/qsharedpointer.cpp
@@ -1285,6 +1285,8 @@
     \relates QSharedPointer
     \since 5.14
 
+    Returns a shared pointer to the pointer held by \a src.
+
     Same as qSharedPointerObjectCast(). This function is provided for STL
     compatibility.
 */
diff --git a/src/gui/kernel/qevent.cpp b/src/gui/kernel/qevent.cpp
index ede68f0719..e36080eee2 100644
--- a/src/gui/kernel/qevent.cpp
+++ b/src/gui/kernel/qevent.cpp
@@ -667,9 +667,9 @@ QHoverEvent::~QHoverEvent()
     if that widget does not handle the event they are sent to the
     focus widget. Wheel events are generated for both mouse wheels
     and trackpad scroll gestures. There are two ways to read the
-    wheel event delta: angleDelta() returns the delta in wheel
-    degrees. This value is always provided. pixelDelta() returns
-    the delta in screen pixels and is available on platforms that
+    wheel event delta: angleDelta() returns the deltas in wheel
+    degrees. These values are always provided. pixelDelta() returns
+    the deltas in screen pixels, and is available on platforms that
     have high-resolution trackpads, such as \macos. If that is the
     case, source() will return Qt::MouseEventSynthesizedBySystem.
 
@@ -852,7 +852,7 @@ QWheelEvent::QWheelEvent(const QPointF &pos, const QPointF& globalPos,
     by \a globalPos.
 
     \a pixelDelta contains the scrolling distance in pixels on screen, while
-    \a angleDelta contains the wheel rotation distance. \a pixelDelta is
+    \a angleDelta contains the wheel rotation angle. \a pixelDelta is
     optional and can be null.
 
     The mouse and keyboard states at the time of the event are specified by
@@ -914,10 +914,16 @@ QWheelEvent::~QWheelEvent()
 /*!
     \fn QPoint QWheelEvent::angleDelta() const
 
-    Returns the distance that the wheel is rotated, in eighths of a
-    degree. A positive value indicates that the wheel was rotated
-    forwards away from the user; a negative value indicates that the
-    wheel was rotated backwards toward the user.
+    Returns the relative amount that the wheel was rotated, in eighths of a
+    degree. A positive value indicates that the wheel was rotated forwards away
+    from the user; a negative value indicates that the wheel was rotated
+    backwards toward the user. \c angleDelta().y() provides the angle through
+    which the common vertical mouse wheel was rotated since the previous event.
+    \c angleDelta().x() provides the angle through which the horizontal mouse
+    wheel was rotated, if the mouse has a horizontal wheel; otherwise it stays
+    at zero. Some mice allow the user to tilt the wheel to perform horizontal
+    scrolling, and some touchpads support a horizontal scrolling gesture; that
+    will also appear in \c angleDelta().x().
 
     Most mouse types work in steps of 15 degrees, in which case the
     delta value is a multiple of 120; i.e., 120 units * 1/8 = 15 degrees.
@@ -926,7 +932,9 @@ QWheelEvent::~QWheelEvent()
     that are less than 120 units (less than 15 degrees). To support this
     possibility, you can either cumulatively add the delta values from events
     until the value of 120 is reached, then scroll the widget, or you can
-    partially scroll the widget in response to each wheel event.
+    partially scroll the widget in response to each wheel event.  But to
+    provide a more native feel, you should prefer \l pixelDelta() on platforms
+    where it's available.
 
     Example:
 
@@ -937,6 +945,8 @@ QWheelEvent::~QWheelEvent()
     \li scrolling is about to begin, but the distance did not yet change (Qt::ScrollBegin),
     \li or scrolling has ended and the distance did not change anymore (Qt::ScrollEnd).
     \endlist
+
+    \see pixelDelta()
 */
 
 /*!
diff --git a/src/gui/text/qtextmarkdownimporter.cpp b/src/gui/text/qtextmarkdownimporter.cpp
index 78d18a714b..88965046ce 100644
--- a/src/gui/text/qtextmarkdownimporter.cpp
+++ b/src/gui/text/qtextmarkdownimporter.cpp
@@ -207,7 +207,12 @@ int QTextMarkdownImporter::cbEnterBlock(int blockType, void *det)
         charFmt.setFontWeight(QFont::Bold);
         blockFmt.setHeadingLevel(int(detail->level));
         m_needsInsertBlock = false;
-        m_cursor->insertBlock(blockFmt, charFmt);
+        if (m_doc->isEmpty()) {
+            m_cursor->setBlockFormat(blockFmt);
+            m_cursor->setCharFormat(charFmt);
+        } else {
+            m_cursor->insertBlock(blockFmt, charFmt);
+        }
         qCDebug(lcMD, "H%d", detail->level);
     } break;
     case MD_BLOCK_LI: {
@@ -592,7 +597,12 @@ void QTextMarkdownImporter::insertBlock()
         blockFormat.setMarker(m_markerType);
     if (!m_listStack.isEmpty())
         blockFormat.setIndent(m_listStack.count());
-    m_cursor->insertBlock(blockFormat, charFormat);
+    if (m_doc->isEmpty()) {
+        m_cursor->setBlockFormat(blockFormat);
+        m_cursor->setCharFormat(charFormat);
+    } else {
+        m_cursor->insertBlock(blockFormat, charFormat);
+    }
     if (m_needsInsertList) {
         m_listStack.push(m_cursor->createList(m_listFormat));
     } else if (!m_listStack.isEmpty() && m_listItem) {
diff --git a/src/network/kernel/qhostinfo.cpp b/src/network/kernel/qhostinfo.cpp
index 6476ff7741..93be053ef3 100644
--- a/src/network/kernel/qhostinfo.cpp
+++ b/src/network/kernel/qhostinfo.cpp
@@ -383,27 +383,6 @@ QHostInfo QHostInfo::fromName(const QString &name)
     return hostInfo;
 }
 
-#ifndef QT_NO_BEARERMANAGEMENT
-QHostInfo QHostInfoPrivate::fromName(const QString &name, QSharedPointer<QNetworkSession> session)
-{
-#if defined QHOSTINFO_DEBUG
-    qDebug("QHostInfoPrivate::fromName(\"%s\") with session %p",name.toLatin1().constData(), session.data());
-#endif
-
-    QHostInfo hostInfo = QHostInfoAgent::fromName(name, session);
-    QHostInfoLookupManager* manager = theHostInfoLookupManager();
-    manager->cache.put(name, hostInfo);
-    return hostInfo;
-}
-#endif
-
-#ifndef QT_NO_BEARERMANAGEMENT
-QHostInfo QHostInfoAgent::fromName(const QString &hostName, QSharedPointer<QNetworkSession>)
-{
-    return QHostInfoAgent::fromName(hostName);
-}
-#endif
-
 QHostInfo QHostInfoAgent::reverseLookup(const QHostAddress &address)
 {
     QHostInfo results;
diff --git a/src/network/kernel/qhostinfo_p.h b/src/network/kernel/qhostinfo_p.h
index 1798ceab0a..d7875a0673 100644
--- a/src/network/kernel/qhostinfo_p.h
+++ b/src/network/kernel/qhostinfo_p.h
@@ -119,9 +119,6 @@ class QHostInfoAgent
 {
 public:
     static QHostInfo fromName(const QString &hostName);
-#ifndef QT_NO_BEARERMANAGEMENT
-    static QHostInfo fromName(const QString &hostName, QSharedPointer<QNetworkSession> networkSession);
-#endif
 private:
     static QHostInfo lookup(const QString &hostName);
     static QHostInfo reverseLookup(const QHostAddress &address);
@@ -136,10 +133,6 @@ public:
           lookupId(0)
     {
     }
-#ifndef QT_NO_BEARERMANAGEMENT
-    //not a public API yet
-    static QHostInfo fromName(const QString &hostName, QSharedPointer<QNetworkSession> networkSession);
-#endif
     static int lookupHostImpl(const QString &name,
                               const QObject *receiver,
                               QtPrivate::QSlotObjectBase *slotObj,
diff --git a/src/network/socket/qabstractsocket.cpp b/src/network/socket/qabstractsocket.cpp
index 0d9e25954d..b8957ce818 100644
--- a/src/network/socket/qabstractsocket.cpp
+++ b/src/network/socket/qabstractsocket.cpp
@@ -2144,20 +2144,13 @@ bool QAbstractSocket::waitForConnected(int msecs)
 #endif
         QHostInfo::abortHostLookup(d->hostLookupId);
         d->hostLookupId = -1;
-#ifndef QT_NO_BEARERMANAGEMENT
-        if (networkSession) {
-            d->_q_startConnecting(QHostInfoPrivate::fromName(d->hostName, networkSession));
-        } else
-#endif
-        {
-            QHostAddress temp;
-            if (temp.setAddress(d->hostName)) {
-                QHostInfo info;
-                info.setAddresses(QList<QHostAddress>() << temp);
-                d->_q_startConnecting(info);
-            } else {
-                d->_q_startConnecting(QHostInfo::fromName(d->hostName));
-            }
+        QHostAddress temp;
+        if (temp.setAddress(d->hostName)) {
+            QHostInfo info;
+            info.setAddresses(QList<QHostAddress>() << temp);
+            d->_q_startConnecting(info);
+        } else {
+            d->_q_startConnecting(QHostInfo::fromName(d->hostName));
         }
     }
     if (state() == UnconnectedState)
diff --git a/src/plugins/platforms/cocoa/cocoa.pro b/src/plugins/platforms/cocoa/cocoa.pro
index 8f2956e7d4..a919963cf4 100644
--- a/src/plugins/platforms/cocoa/cocoa.pro
+++ b/src/plugins/platforms/cocoa/cocoa.pro
@@ -25,7 +25,6 @@ SOURCES += main.mm \
     qcocoaclipboard.mm \
     qcocoadrag.mm \
     qmacclipboard.mm \
-    qcocoasystemsettings.mm \
     qcocoainputcontext.mm \
     qcocoaservices.mm \
     qcocoasystemtrayicon.mm \
@@ -59,7 +58,6 @@ HEADERS += qcocoaintegration.h \
     qcocoaclipboard.h \
     qcocoadrag.h \
     qmacclipboard.h \
-    qcocoasystemsettings.h \
     qcocoainputcontext.h \
     qcocoaservices.h \
     qcocoasystemtrayicon.h \
diff --git a/src/plugins/platforms/cocoa/qcocoasystemsettings.h b/src/plugins/platforms/cocoa/qcocoasystemsettings.h
deleted file mode 100644
index cf5688bbed..0000000000
--- a/src/plugins/platforms/cocoa/qcocoasystemsettings.h
+++ /dev/null
@@ -1,54 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the plugins of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 3 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL3 included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 3 requirements
-** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 2.0 or (at your option) the GNU General
-** Public license version 3 or any later version approved by the KDE Free
-** Qt Foundation. The licenses are as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-2.0.html and
-** https://www.gnu.org/licenses/gpl-3.0.html.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#ifndef QCOCOASYSTEMSETTINGS_H
-#define QCOCOASYSTEMSETTINGS_H
-
-#include <QtCore/qhash.h>
-#include <QtGui/qpalette.h>
-#include <qpa/qplatformtheme.h>
-
-QT_BEGIN_NAMESPACE
-
-QPalette * qt_mac_createSystemPalette();
-QHash<QPlatformTheme::Palette, QPalette*> qt_mac_createRolePalettes();
-
-QT_END_NAMESPACE
-
-#endif
diff --git a/src/plugins/platforms/cocoa/qcocoasystemsettings.mm b/src/plugins/platforms/cocoa/qcocoasystemsettings.mm
deleted file mode 100644
index cb25bd7d81..0000000000
--- a/src/plugins/platforms/cocoa/qcocoasystemsettings.mm
+++ /dev/null
@@ -1,245 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2019 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the plugins of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 3 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL3 included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 3 requirements
-** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 2.0 or (at your option) the GNU General
-** Public license version 3 or any later version approved by the KDE Free
-** Qt Foundation. The licenses are as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-2.0.html and
-** https://www.gnu.org/licenses/gpl-3.0.html.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#include "qcocoasystemsettings.h"
-
-#include "qcocoahelpers.h"
-
-#include <QtCore/private/qcore_mac_p.h>
-#include <QtGui/qfont.h>
-#include <QtGui/private/qcoregraphics_p.h>
-
-#if !QT_MACOS_PLATFORM_SDK_EQUAL_OR_ABOVE(__MAC_10_14)
-@interface NSColor (MojaveForwardDeclarations)
-@property (class, strong, readonly) NSColor *selectedContentBackgroundColor NS_AVAILABLE_MAC(10_14);
-@property (class, strong, readonly) NSColor *unemphasizedSelectedTextBackgroundColor NS_AVAILABLE_MAC(10_14);
-@property (class, strong, readonly) NSColor *unemphasizedSelectedTextColor NS_AVAILABLE_MAC(10_14);
-@property (class, strong, readonly) NSColor *unemphasizedSelectedContentBackgroundColor NS_AVAILABLE_MAC(10_14);
-@property (class, strong, readonly) NSArray<NSColor *> *alternatingContentBackgroundColors NS_AVAILABLE_MAC(10_14);
-// Missing from non-Mojave SDKs, even if introduced in 10.10
-@property (class, strong, readonly) NSColor *linkColor NS_AVAILABLE_MAC(10_10);
-@end
-#endif
-
-QT_BEGIN_NAMESPACE
-
-QPalette * qt_mac_createSystemPalette()
-{
-    QColor qc;
-
-    // Standard palette initialization (copied from Qt 4 styles)
-    QBrush backgroundBrush = qt_mac_toQBrush([NSColor windowBackgroundColor]);
-    QColor background = backgroundBrush.color();
-    QColor light(background.lighter(110));
-    QColor dark(background.darker(160));
-    QColor mid(background.darker(140));
-    QPalette *palette = new QPalette(Qt::black, background, light, dark, mid, Qt::black, Qt::white);
-
-    palette->setBrush(QPalette::Window, backgroundBrush);
-
-    palette->setBrush(QPalette::Disabled, QPalette::WindowText, dark);
-    palette->setBrush(QPalette::Disabled, QPalette::Text, dark);
-    palette->setBrush(QPalette::Disabled, QPalette::ButtonText, dark);
-    palette->setBrush(QPalette::Disabled, QPalette::Base, backgroundBrush);
-    QBrush textBackgroundBrush = qt_mac_toQBrush([NSColor textBackgroundColor]);
-    palette->setBrush(QPalette::Active, QPalette::Base, textBackgroundBrush);
-    palette->setBrush(QPalette::Inactive, QPalette::Base, textBackgroundBrush);
-    palette->setColor(QPalette::Disabled, QPalette::Dark, QColor(191, 191, 191));
-    palette->setColor(QPalette::Active, QPalette::Dark, QColor(191, 191, 191));
-    palette->setColor(QPalette::Inactive, QPalette::Dark, QColor(191, 191, 191));
-
-    // System palette initialization:
-    QBrush br = qt_mac_toQBrush([NSColor selectedControlColor]);
-    palette->setBrush(QPalette::Active, QPalette::Highlight, br);
-    if (__builtin_available(macOS 10.14, *)) {
-        const auto inactiveHighlight = qt_mac_toQBrush([NSColor unemphasizedSelectedContentBackgroundColor]);
-        palette->setBrush(QPalette::Inactive, QPalette::Highlight, inactiveHighlight);
-        palette->setBrush(QPalette::Disabled, QPalette::Highlight, inactiveHighlight);
-    } else {
-        palette->setBrush(QPalette::Inactive, QPalette::Highlight, br);
-        palette->setBrush(QPalette::Disabled, QPalette::Highlight, br);
-    }
-
-    palette->setBrush(QPalette::Shadow, qt_mac_toQColor([NSColor shadowColor]));
-
-    qc = qt_mac_toQColor([NSColor controlTextColor]);
-    palette->setColor(QPalette::Active, QPalette::Text, qc);
-    palette->setColor(QPalette::Active, QPalette::WindowText, qc);
-    palette->setColor(QPalette::Active, QPalette::HighlightedText, qc);
-    palette->setColor(QPalette::Inactive, QPalette::Text, qc);
-    palette->setColor(QPalette::Inactive, QPalette::WindowText, qc);
-    palette->setColor(QPalette::Inactive, QPalette::HighlightedText, qc);
-
-    qc = qt_mac_toQColor([NSColor disabledControlTextColor]);
-    palette->setColor(QPalette::Disabled, QPalette::Text, qc);
-    palette->setColor(QPalette::Disabled, QPalette::WindowText, qc);
-    palette->setColor(QPalette::Disabled, QPalette::HighlightedText, qc);
-
-    palette->setBrush(QPalette::ToolTipBase, qt_mac_toQBrush([NSColor controlColor]));
-
-    palette->setColor(QPalette::Normal, QPalette::Link, qt_mac_toQColor([NSColor linkColor]));
-
-    return palette;
-}
-
-struct QMacPaletteMap {
-    inline QMacPaletteMap(QPlatformTheme::Palette p, NSColor *a, NSColor *i) :
-        active(a), inactive(i), paletteRole(p) { }
-
-    NSColor *active;
-    NSColor *inactive;
-    QPlatformTheme::Palette paletteRole;
-};
-
-#define MAC_PALETTE_ENTRY(pal, active, inactive) \
-    QMacPaletteMap(pal, [NSColor active], [NSColor inactive])
-static QMacPaletteMap mac_widget_colors[] = {
-    MAC_PALETTE_ENTRY(QPlatformTheme::ToolButtonPalette, controlTextColor, disabledControlTextColor),
-    MAC_PALETTE_ENTRY(QPlatformTheme::ButtonPalette, controlTextColor, disabledControlTextColor),
-    MAC_PALETTE_ENTRY(QPlatformTheme::HeaderPalette, headerTextColor, disabledControlTextColor),
-    MAC_PALETTE_ENTRY(QPlatformTheme::ComboBoxPalette, controlTextColor, disabledControlTextColor),
-    MAC_PALETTE_ENTRY(QPlatformTheme::ItemViewPalette, textColor, disabledControlTextColor),
-    MAC_PALETTE_ENTRY(QPlatformTheme::MessageBoxLabelPalette, textColor, disabledControlTextColor),
-    MAC_PALETTE_ENTRY(QPlatformTheme::TabBarPalette, controlTextColor, disabledControlTextColor),
-    MAC_PALETTE_ENTRY(QPlatformTheme::LabelPalette, textColor, disabledControlTextColor),
-    MAC_PALETTE_ENTRY(QPlatformTheme::GroupBoxPalette, textColor, disabledControlTextColor),
-    MAC_PALETTE_ENTRY(QPlatformTheme::MenuPalette, controlTextColor, disabledControlTextColor),
-    MAC_PALETTE_ENTRY(QPlatformTheme::MenuBarPalette, controlTextColor, disabledControlTextColor),
-    MAC_PALETTE_ENTRY(QPlatformTheme::TextEditPalette, textColor, disabledControlTextColor),
-    MAC_PALETTE_ENTRY(QPlatformTheme::TextLineEditPalette, textColor, disabledControlTextColor)
-};
-#undef MAC_PALETTE_ENTRY
-
-static const int mac_widget_colors_count = sizeof(mac_widget_colors) / sizeof(mac_widget_colors[0]);
-
-QHash<QPlatformTheme::Palette, QPalette*> qt_mac_createRolePalettes()
-{
-    QHash<QPlatformTheme::Palette, QPalette*> palettes;
-    QColor qc;
-    for (int i = 0; i < mac_widget_colors_count; i++) {
-        QPalette &pal = *qt_mac_createSystemPalette();
-        if (mac_widget_colors[i].active) {
-            qc = qt_mac_toQColor(mac_widget_colors[i].active);
-            pal.setColor(QPalette::Active, QPalette::Text, qc);
-            pal.setColor(QPalette::Inactive, QPalette::Text, qc);
-            pal.setColor(QPalette::Active, QPalette::WindowText, qc);
-            pal.setColor(QPalette::Inactive, QPalette::WindowText, qc);
-            pal.setColor(QPalette::Active, QPalette::HighlightedText, qc);
-            pal.setColor(QPalette::Inactive, QPalette::HighlightedText, qc);
-            pal.setColor(QPalette::Active, QPalette::ButtonText, qc);
-            pal.setColor(QPalette::Inactive, QPalette::ButtonText, qc);
-            qc = qt_mac_toQColor(mac_widget_colors[i].inactive);
-            pal.setColor(QPalette::Disabled, QPalette::Text, qc);
-            pal.setColor(QPalette::Disabled, QPalette::WindowText, qc);
-            pal.setColor(QPalette::Disabled, QPalette::HighlightedText, qc);
-            pal.setColor(QPalette::Disabled, QPalette::ButtonText, qc);
-        }
-        if (mac_widget_colors[i].paletteRole == QPlatformTheme::MenuPalette
-                || mac_widget_colors[i].paletteRole == QPlatformTheme::MenuBarPalette) {
-            NSColor *selectedMenuItemColor = nil;
-            if (__builtin_available(macOS 10.14, *)) {
-                // Cheap approximation for NSVisualEffectView (see deprecation note for selectedMenuItemTextColor)
-                selectedMenuItemColor = [[NSColor selectedContentBackgroundColor] highlightWithLevel:0.4];
-            } else {
-                // selectedMenuItemColor would presumably be the correct color to use as the background
-                // for selected menu items. But that color is always blue, and doesn't follow the
-                // appearance color in system preferences. So we therefore deliberatly choose to use
-                // keyboardFocusIndicatorColor instead, which appears to have the same color value.
-                selectedMenuItemColor = [NSColor keyboardFocusIndicatorColor];
-            }
-            pal.setBrush(QPalette::Highlight, qt_mac_toQColor(selectedMenuItemColor));
-            qc = qt_mac_toQColor([NSColor labelColor]);
-            pal.setBrush(QPalette::ButtonText, qc);
-            pal.setBrush(QPalette::Text, qc);
-            qc = qt_mac_toQColor([NSColor selectedMenuItemTextColor]);
-            pal.setBrush(QPalette::HighlightedText, qc);
-            qc = qt_mac_toQColor([NSColor disabledControlTextColor]);
-            pal.setBrush(QPalette::Disabled, QPalette::Text, qc);
-        } else if ((mac_widget_colors[i].paletteRole == QPlatformTheme::ButtonPalette)
-                || (mac_widget_colors[i].paletteRole == QPlatformTheme::HeaderPalette)
-                || (mac_widget_colors[i].paletteRole == QPlatformTheme::TabBarPalette)) {
-            pal.setColor(QPalette::Disabled, QPalette::ButtonText,
-                         pal.color(QPalette::Disabled, QPalette::Text));
-            pal.setColor(QPalette::Inactive, QPalette::ButtonText,
-                         pal.color(QPalette::Inactive, QPalette::Text));
-            pal.setColor(QPalette::Active, QPalette::ButtonText,
-                         pal.color(QPalette::Active, QPalette::Text));
-        } else if (mac_widget_colors[i].paletteRole == QPlatformTheme::ItemViewPalette) {
-            NSArray<NSColor *> *baseColors = nil;
-            NSColor *activeHighlightColor = nil;
-            if (__builtin_available(macOS 10.14, *)) {
-                baseColors = [NSColor alternatingContentBackgroundColors];
-                activeHighlightColor = [NSColor selectedContentBackgroundColor];
-                pal.setBrush(QPalette::Inactive, QPalette::HighlightedText,
-                             qt_mac_toQBrush([NSColor unemphasizedSelectedTextColor]));
-            } else {
-                baseColors = [NSColor controlAlternatingRowBackgroundColors];
-                activeHighlightColor = [NSColor alternateSelectedControlColor];
-                pal.setBrush(QPalette::Inactive, QPalette::HighlightedText,
-                             pal.brush(QPalette::Active, QPalette::Text));
-            }
-            pal.setBrush(QPalette::Base, qt_mac_toQBrush(baseColors[0]));
-            pal.setBrush(QPalette::AlternateBase, qt_mac_toQBrush(baseColors[1]));
-            pal.setBrush(QPalette::Active, QPalette::Highlight,
-                         qt_mac_toQBrush(activeHighlightColor));
-            pal.setBrush(QPalette::Active, QPalette::HighlightedText,
-                         qt_mac_toQBrush([NSColor alternateSelectedControlTextColor]));
-            pal.setBrush(QPalette::Inactive, QPalette::Text,
-                         pal.brush(QPalette::Active, QPalette::Text));
-        } else if (mac_widget_colors[i].paletteRole == QPlatformTheme::TextEditPalette) {
-            pal.setBrush(QPalette::Active, QPalette::Base, qt_mac_toQColor([NSColor textBackgroundColor]));
-            pal.setBrush(QPalette::Inactive, QPalette::Text,
-                          pal.brush(QPalette::Active, QPalette::Text));
-            pal.setBrush(QPalette::Inactive, QPalette::HighlightedText,
-                          pal.brush(QPalette::Active, QPalette::Text));
-        } else if (mac_widget_colors[i].paletteRole == QPlatformTheme::TextLineEditPalette
-                   || mac_widget_colors[i].paletteRole == QPlatformTheme::ComboBoxPalette) {
-            pal.setBrush(QPalette::Active, QPalette::Base, qt_mac_toQColor([NSColor textBackgroundColor]));
-            pal.setBrush(QPalette::Disabled, QPalette::Base,
-                         pal.brush(QPalette::Active, QPalette::Base));
-        } else if (mac_widget_colors[i].paletteRole == QPlatformTheme::LabelPalette) {
-            qc = qt_mac_toQColor([NSColor labelColor]);
-            pal.setBrush(QPalette::Inactive, QPalette::ToolTipText, qc);
-        }
-        palettes.insert(mac_widget_colors[i].paletteRole, &pal);
-    }
-    return palettes;
-}
-
-QT_END_NAMESPACE
diff --git a/src/plugins/platforms/cocoa/qcocoatheme.mm b/src/plugins/platforms/cocoa/qcocoatheme.mm
index 387df65721..a76ba300e9 100644
--- a/src/plugins/platforms/cocoa/qcocoatheme.mm
+++ b/src/plugins/platforms/cocoa/qcocoatheme.mm
@@ -45,7 +45,6 @@
 #include <QtCore/QOperatingSystemVersion>
 #include <QtCore/QVariant>
 
-#include "qcocoasystemsettings.h"
 #include "qcocoasystemtrayicon.h"
 #include "qcocoamenuitem.h"
 #include "qcocoamenu.h"
@@ -80,8 +79,203 @@
 
 #include <CoreServices/CoreServices.h>
 
+#if !QT_MACOS_PLATFORM_SDK_EQUAL_OR_ABOVE(__MAC_10_14)
+@interface NSColor (MojaveForwardDeclarations)
+@property (class, strong, readonly) NSColor *selectedContentBackgroundColor NS_AVAILABLE_MAC(10_14);
+@property (class, strong, readonly) NSColor *unemphasizedSelectedTextBackgroundColor NS_AVAILABLE_MAC(10_14);
+@property (class, strong, readonly) NSColor *unemphasizedSelectedTextColor NS_AVAILABLE_MAC(10_14);
+@property (class, strong, readonly) NSColor *unemphasizedSelectedContentBackgroundColor NS_AVAILABLE_MAC(10_14);
+@property (class, strong, readonly) NSArray<NSColor *> *alternatingContentBackgroundColors NS_AVAILABLE_MAC(10_14);
+// Missing from non-Mojave SDKs, even if introduced in 10.10
+@property (class, strong, readonly) NSColor *linkColor NS_AVAILABLE_MAC(10_10);
+@end
+#endif
+
 QT_BEGIN_NAMESPACE
 
+static QPalette *qt_mac_createSystemPalette()
+{
+    QColor qc;
+
+    // Standard palette initialization (copied from Qt 4 styles)
+    QBrush backgroundBrush = qt_mac_toQBrush([NSColor windowBackgroundColor]);
+    QColor background = backgroundBrush.color();
+    QColor light(background.lighter(110));
+    QColor dark(background.darker(160));
+    QColor mid(background.darker(140));
+    QPalette *palette = new QPalette(Qt::black, background, light, dark, mid, Qt::black, Qt::white);
+
+    palette->setBrush(QPalette::Window, backgroundBrush);
+
+    palette->setBrush(QPalette::Disabled, QPalette::WindowText, dark);
+    palette->setBrush(QPalette::Disabled, QPalette::Text, dark);
+    palette->setBrush(QPalette::Disabled, QPalette::ButtonText, dark);
+    palette->setBrush(QPalette::Disabled, QPalette::Base, backgroundBrush);
+    QBrush textBackgroundBrush = qt_mac_toQBrush([NSColor textBackgroundColor]);
+    palette->setBrush(QPalette::Active, QPalette::Base, textBackgroundBrush);
+    palette->setBrush(QPalette::Inactive, QPalette::Base, textBackgroundBrush);
+    palette->setColor(QPalette::Disabled, QPalette::Dark, QColor(191, 191, 191));
+    palette->setColor(QPalette::Active, QPalette::Dark, QColor(191, 191, 191));
+    palette->setColor(QPalette::Inactive, QPalette::Dark, QColor(191, 191, 191));
+
+    // System palette initialization:
+    QBrush br = qt_mac_toQBrush([NSColor selectedControlColor]);
+    palette->setBrush(QPalette::Active, QPalette::Highlight, br);
+    if (__builtin_available(macOS 10.14, *)) {
+        const auto inactiveHighlight = qt_mac_toQBrush([NSColor unemphasizedSelectedContentBackgroundColor]);
+        palette->setBrush(QPalette::Inactive, QPalette::Highlight, inactiveHighlight);
+        palette->setBrush(QPalette::Disabled, QPalette::Highlight, inactiveHighlight);
+    } else {
+        palette->setBrush(QPalette::Inactive, QPalette::Highlight, br);
+        palette->setBrush(QPalette::Disabled, QPalette::Highlight, br);
+    }
+
+    palette->setBrush(QPalette::Shadow, qt_mac_toQColor([NSColor shadowColor]));
+
+    qc = qt_mac_toQColor([NSColor controlTextColor]);
+    palette->setColor(QPalette::Active, QPalette::Text, qc);
+    palette->setColor(QPalette::Active, QPalette::WindowText, qc);
+    palette->setColor(QPalette::Active, QPalette::HighlightedText, qc);
+    palette->setColor(QPalette::Inactive, QPalette::Text, qc);
+    palette->setColor(QPalette::Inactive, QPalette::WindowText, qc);
+    palette->setColor(QPalette::Inactive, QPalette::HighlightedText, qc);
+
+    qc = qt_mac_toQColor([NSColor disabledControlTextColor]);
+    palette->setColor(QPalette::Disabled, QPalette::Text, qc);
+    palette->setColor(QPalette::Disabled, QPalette::WindowText, qc);
+    palette->setColor(QPalette::Disabled, QPalette::HighlightedText, qc);
+
+    palette->setBrush(QPalette::ToolTipBase, qt_mac_toQBrush([NSColor controlColor]));
+
+    palette->setColor(QPalette::Normal, QPalette::Link, qt_mac_toQColor([NSColor linkColor]));
+
+    return palette;
+}
+
+struct QMacPaletteMap {
+    inline QMacPaletteMap(QPlatformTheme::Palette p, NSColor *a, NSColor *i) :
+        active(a), inactive(i), paletteRole(p) { }
+
+    NSColor *active;
+    NSColor *inactive;
+    QPlatformTheme::Palette paletteRole;
+};
+
+#define MAC_PALETTE_ENTRY(pal, active, inactive) \
+    QMacPaletteMap(pal, [NSColor active], [NSColor inactive])
+static QMacPaletteMap mac_widget_colors[] = {
+    MAC_PALETTE_ENTRY(QPlatformTheme::ToolButtonPalette, controlTextColor, disabledControlTextColor),
+    MAC_PALETTE_ENTRY(QPlatformTheme::ButtonPalette, controlTextColor, disabledControlTextColor),
+    MAC_PALETTE_ENTRY(QPlatformTheme::HeaderPalette, headerTextColor, disabledControlTextColor),
+    MAC_PALETTE_ENTRY(QPlatformTheme::ComboBoxPalette, controlTextColor, disabledControlTextColor),
+    MAC_PALETTE_ENTRY(QPlatformTheme::ItemViewPalette, textColor, disabledControlTextColor),
+    MAC_PALETTE_ENTRY(QPlatformTheme::MessageBoxLabelPalette, textColor, disabledControlTextColor),
+    MAC_PALETTE_ENTRY(QPlatformTheme::TabBarPalette, controlTextColor, disabledControlTextColor),
+    MAC_PALETTE_ENTRY(QPlatformTheme::LabelPalette, textColor, disabledControlTextColor),
+    MAC_PALETTE_ENTRY(QPlatformTheme::GroupBoxPalette, textColor, disabledControlTextColor),
+    MAC_PALETTE_ENTRY(QPlatformTheme::MenuPalette, controlTextColor, disabledControlTextColor),
+    MAC_PALETTE_ENTRY(QPlatformTheme::MenuBarPalette, controlTextColor, disabledControlTextColor),
+    MAC_PALETTE_ENTRY(QPlatformTheme::TextEditPalette, textColor, disabledControlTextColor),
+    MAC_PALETTE_ENTRY(QPlatformTheme::TextLineEditPalette, textColor, disabledControlTextColor)
+};
+#undef MAC_PALETTE_ENTRY
+
+static const int mac_widget_colors_count = sizeof(mac_widget_colors) / sizeof(mac_widget_colors[0]);
+
+static QHash<QPlatformTheme::Palette, QPalette*> qt_mac_createRolePalettes()
+{
+    QHash<QPlatformTheme::Palette, QPalette*> palettes;
+    QColor qc;
+    for (int i = 0; i < mac_widget_colors_count; i++) {
+        QPalette &pal = *qt_mac_createSystemPalette();
+        if (mac_widget_colors[i].active) {
+            qc = qt_mac_toQColor(mac_widget_colors[i].active);
+            pal.setColor(QPalette::Active, QPalette::Text, qc);
+            pal.setColor(QPalette::Inactive, QPalette::Text, qc);
+            pal.setColor(QPalette::Active, QPalette::WindowText, qc);
+            pal.setColor(QPalette::Inactive, QPalette::WindowText, qc);
+            pal.setColor(QPalette::Active, QPalette::HighlightedText, qc);
+            pal.setColor(QPalette::Inactive, QPalette::HighlightedText, qc);
+            pal.setColor(QPalette::Active, QPalette::ButtonText, qc);
+            pal.setColor(QPalette::Inactive, QPalette::ButtonText, qc);
+            qc = qt_mac_toQColor(mac_widget_colors[i].inactive);
+            pal.setColor(QPalette::Disabled, QPalette::Text, qc);
+            pal.setColor(QPalette::Disabled, QPalette::WindowText, qc);
+            pal.setColor(QPalette::Disabled, QPalette::HighlightedText, qc);
+            pal.setColor(QPalette::Disabled, QPalette::ButtonText, qc);
+        }
+        if (mac_widget_colors[i].paletteRole == QPlatformTheme::MenuPalette
+                || mac_widget_colors[i].paletteRole == QPlatformTheme::MenuBarPalette) {
+            NSColor *selectedMenuItemColor = nil;
+            if (__builtin_available(macOS 10.14, *)) {
+                // Cheap approximation for NSVisualEffectView (see deprecation note for selectedMenuItemTextColor)
+                selectedMenuItemColor = [[NSColor selectedContentBackgroundColor] highlightWithLevel:0.4];
+            } else {
+                // selectedMenuItemColor would presumably be the correct color to use as the background
+                // for selected menu items. But that color is always blue, and doesn't follow the
+                // appearance color in system preferences. So we therefore deliberatly choose to use
+                // keyboardFocusIndicatorColor instead, which appears to have the same color value.
+                selectedMenuItemColor = [NSColor keyboardFocusIndicatorColor];
+            }
+            pal.setBrush(QPalette::Highlight, qt_mac_toQColor(selectedMenuItemColor));
+            qc = qt_mac_toQColor([NSColor labelColor]);
+            pal.setBrush(QPalette::ButtonText, qc);
+            pal.setBrush(QPalette::Text, qc);
+            qc = qt_mac_toQColor([NSColor selectedMenuItemTextColor]);
+            pal.setBrush(QPalette::HighlightedText, qc);
+            qc = qt_mac_toQColor([NSColor disabledControlTextColor]);
+            pal.setBrush(QPalette::Disabled, QPalette::Text, qc);
+        } else if ((mac_widget_colors[i].paletteRole == QPlatformTheme::ButtonPalette)
+                || (mac_widget_colors[i].paletteRole == QPlatformTheme::HeaderPalette)
+                || (mac_widget_colors[i].paletteRole == QPlatformTheme::TabBarPalette)) {
+            pal.setColor(QPalette::Disabled, QPalette::ButtonText,
+                         pal.color(QPalette::Disabled, QPalette::Text));
+            pal.setColor(QPalette::Inactive, QPalette::ButtonText,
+                         pal.color(QPalette::Inactive, QPalette::Text));
+            pal.setColor(QPalette::Active, QPalette::ButtonText,
+                         pal.color(QPalette::Active, QPalette::Text));
+        } else if (mac_widget_colors[i].paletteRole == QPlatformTheme::ItemViewPalette) {
+            NSArray<NSColor *> *baseColors = nil;
+            NSColor *activeHighlightColor = nil;
+            if (__builtin_available(macOS 10.14, *)) {
+                baseColors = [NSColor alternatingContentBackgroundColors];
+                activeHighlightColor = [NSColor selectedContentBackgroundColor];
+                pal.setBrush(QPalette::Inactive, QPalette::HighlightedText,
+                             qt_mac_toQBrush([NSColor unemphasizedSelectedTextColor]));
+            } else {
+                baseColors = [NSColor controlAlternatingRowBackgroundColors];
+                activeHighlightColor = [NSColor alternateSelectedControlColor];
+                pal.setBrush(QPalette::Inactive, QPalette::HighlightedText,
+                             pal.brush(QPalette::Active, QPalette::Text));
+            }
+            pal.setBrush(QPalette::Base, qt_mac_toQBrush(baseColors[0]));
+            pal.setBrush(QPalette::AlternateBase, qt_mac_toQBrush(baseColors[1]));
+            pal.setBrush(QPalette::Active, QPalette::Highlight,
+                         qt_mac_toQBrush(activeHighlightColor));
+            pal.setBrush(QPalette::Active, QPalette::HighlightedText,
+                         qt_mac_toQBrush([NSColor alternateSelectedControlTextColor]));
+            pal.setBrush(QPalette::Inactive, QPalette::Text,
+                         pal.brush(QPalette::Active, QPalette::Text));
+        } else if (mac_widget_colors[i].paletteRole == QPlatformTheme::TextEditPalette) {
+            pal.setBrush(QPalette::Active, QPalette::Base, qt_mac_toQColor([NSColor textBackgroundColor]));
+            pal.setBrush(QPalette::Inactive, QPalette::Text,
+                          pal.brush(QPalette::Active, QPalette::Text));
+            pal.setBrush(QPalette::Inactive, QPalette::HighlightedText,
+                          pal.brush(QPalette::Active, QPalette::Text));
+        } else if (mac_widget_colors[i].paletteRole == QPlatformTheme::TextLineEditPalette
+                   || mac_widget_colors[i].paletteRole == QPlatformTheme::ComboBoxPalette) {
+            pal.setBrush(QPalette::Active, QPalette::Base, qt_mac_toQColor([NSColor textBackgroundColor]));
+            pal.setBrush(QPalette::Disabled, QPalette::Base,
+                         pal.brush(QPalette::Active, QPalette::Base));
+        } else if (mac_widget_colors[i].paletteRole == QPlatformTheme::LabelPalette) {
+            qc = qt_mac_toQColor([NSColor labelColor]);
+            pal.setBrush(QPalette::Inactive, QPalette::ToolTipText, qc);
+        }
+        palettes.insert(mac_widget_colors[i].paletteRole, &pal);
+    }
+    return palettes;
+}
+
 const char *QCocoaTheme::name = "cocoa";
 
 QCocoaTheme::QCocoaTheme()
diff --git a/src/plugins/platforms/wasm/qwasmclipboard.cpp b/src/plugins/platforms/wasm/qwasmclipboard.cpp
index d4a1e4dd50..fb46f1534f 100644
--- a/src/plugins/platforms/wasm/qwasmclipboard.cpp
+++ b/src/plugins/platforms/wasm/qwasmclipboard.cpp
@@ -198,7 +198,9 @@ void QWasmClipboard::installEventHandlers(const QString &canvasId)
         return;
 
     // Fallback path for browsers which do not support direct clipboard access
-    val canvas = val::global(canvasId.toUtf8().constData());
+    val document = val::global("document");
+    val canvas = document.call<val>("getElementById", val(canvasId.toUtf8().constData()));
+
     canvas.call<void>("addEventListener", std::string("cut"),
                       val::module_property("qtClipboardCutTo"));
     canvas.call<void>("addEventListener", std::string("copy"),
diff --git a/src/plugins/platforms/wasm/qwasmcursor.cpp b/src/plugins/platforms/wasm/qwasmcursor.cpp
index 28ec3b58dd..c04fa6441a 100644
--- a/src/plugins/platforms/wasm/qwasmcursor.cpp
+++ b/src/plugins/platforms/wasm/qwasmcursor.cpp
@@ -36,6 +36,8 @@
 #include <emscripten/emscripten.h>
 #include <emscripten/bind.h>
 
+using namespace emscripten;
+
 void QWasmCursor::changeCursor(QCursor *windowCursor, QWindow *window)
 {
     if (!windowCursor || !window)
@@ -54,8 +56,10 @@ void QWasmCursor::changeCursor(QCursor *windowCursor, QWindow *window)
         htmlCursorName = "auto";
 
     // Set cursor on the canvas
-    QString canvasId = QWasmScreen::get(screen)->canvasId();
-    emscripten::val canvasStyle = emscripten::val::global(canvasId.toUtf8().constData())["style"];
+    QByteArray canvasId = QWasmScreen::get(screen)->canvasId().toUtf8();
+    val document = val::global("document");
+    val canvas = document.call<val>("getElementById", val(canvasId.constData()));
+    val canvasStyle = canvas["style"];
     canvasStyle.set("cursor", emscripten::val(htmlCursorName.constData()));
 }
 
diff --git a/src/plugins/platforms/wasm/qwasmeventtranslator.cpp b/src/plugins/platforms/wasm/qwasmeventtranslator.cpp
index a4ec78f27b..d6ea147ccf 100644
--- a/src/plugins/platforms/wasm/qwasmeventtranslator.cpp
+++ b/src/plugins/platforms/wasm/qwasmeventtranslator.cpp
@@ -47,9 +47,10 @@
 
 #include <iostream>
 
-QT_BEGIN_NAMESPACE
 using namespace emscripten;
 
+QT_BEGIN_NAMESPACE
+
 typedef struct emkb2qt {
     const char *em;
     unsigned int qt;
@@ -353,10 +354,11 @@ void QWasmEventTranslator::initEventHandlers()
         g_useNaturalScrolling = false; // make this !default on macOS
 
         if (emscripten::val::global("window")["safari"].isUndefined()) {
-
-            emscripten::val::global(canvasId).call<void>("addEventListener",
-                                                         std::string("wheel"),
-                                                         val::module_property("qtMouseWheelEvent"));
+            val document = val::global("document");
+            val canvas = document.call<val>("getElementById", val(canvasId));
+            canvas.call<void>("addEventListener",
+                              std::string("wheel"),
+                              val::module_property("qtMouseWheelEvent"));
         }
     }
 
diff --git a/src/plugins/platforms/wasm/qwasmopenglcontext.cpp b/src/plugins/platforms/wasm/qwasmopenglcontext.cpp
index 0532b7e726..501ab99116 100644
--- a/src/plugins/platforms/wasm/qwasmopenglcontext.cpp
+++ b/src/plugins/platforms/wasm/qwasmopenglcontext.cpp
@@ -106,7 +106,7 @@ EMSCRIPTEN_WEBGL_CONTEXT_HANDLE QWasmOpenGLContext::createEmscriptenContext(cons
     attributes.depth = useDepthStencil;
     attributes.stencil = useDepthStencil;
 
-    EMSCRIPTEN_WEBGL_CONTEXT_HANDLE context = emscripten_webgl_create_context(canvasId.toLocal8Bit().constData(), &attributes);
+    EMSCRIPTEN_WEBGL_CONTEXT_HANDLE context = emscripten_webgl_create_context(canvasId.toUtf8().constData(), &attributes);
 
     return context;
 }
diff --git a/src/plugins/platforms/wasm/qwasmscreen.cpp b/src/plugins/platforms/wasm/qwasmscreen.cpp
index b6c9b9e377..d50765e3fb 100644
--- a/src/plugins/platforms/wasm/qwasmscreen.cpp
+++ b/src/plugins/platforms/wasm/qwasmscreen.cpp
@@ -44,6 +44,7 @@
 #include <QtGui/qguiapplication.h>
 #include <private/qhighdpiscaling_p.h>
 
+using namespace emscripten;
 
 QT_BEGIN_NAMESPACE
 
@@ -184,13 +185,15 @@ void QWasmScreen::updateQScreenAndCanvasRenderSize()
     QSizeF cssSize(css_width, css_height);
 
     QSizeF canvasSize = cssSize * devicePixelRatio();
-    emscripten::val canvas = emscripten::val::global(canvasId.constData());
+    val document = val::global("document");
+    val canvas = document.call<val>("getElementById", val(canvasId.constData()));
+
     canvas.set("width", canvasSize.width());
     canvas.set("height", canvasSize.height());
 
     QPoint offset;
-    offset.setX(emscripten::val::global(canvasId.constData())["offsetTop"].as<int>());
-    offset.setY(emscripten::val::global(canvasId.constData())["offsetLeft"].as<int>());
+    offset.setX(canvas["offsetTop"].as<int>());
+    offset.setY(canvas["offsetLeft"].as<int>());
 
     emscripten::val rect = canvas.call<emscripten::val>("getBoundingClientRect");
     QPoint position(rect["left"].as<int>() - offset.x(), rect["top"].as<int>() - offset.y());
diff --git a/src/plugins/platforms/windows/qwindowscontext.cpp b/src/plugins/platforms/windows/qwindowscontext.cpp
index a2dd25f8cc..d31352b854 100644
--- a/src/plugins/platforms/windows/qwindowscontext.cpp
+++ b/src/plugins/platforms/windows/qwindowscontext.cpp
@@ -604,15 +604,12 @@ QString QWindowsContext::registerWindowClass(QString cname,
     // each one has to have window class names with a unique name
     // The first instance gets the unmodified name; if the class
     // has already been registered by another instance of Qt then
-    // add a UUID.
-    static int classExists = -1;
-
+    // add a UUID. The check needs to be performed for each name
+    // in case new message windows are added (QTBUG-81347).
     const auto appInstance = static_cast<HINSTANCE>(GetModuleHandle(nullptr));
-    if (classExists == -1) {
-        WNDCLASS wcinfo;
-        classExists = GetClassInfo(appInstance, reinterpret_cast<LPCWSTR>(cname.utf16()), &wcinfo);
-        classExists = classExists && wcinfo.lpfnWndProc != proc;
-    }
+    WNDCLASS wcinfo;
+    const bool classExists = GetClassInfo(appInstance, reinterpret_cast<LPCWSTR>(cname.utf16()), &wcinfo) == TRUE
+        && wcinfo.lpfnWndProc != proc;
 
     if (classExists)
         cname += QUuid::createUuid().toString();
diff --git a/src/plugins/platforms/windows/uiautomation/qwindowsuiaaccessibility.cpp b/src/plugins/platforms/windows/uiautomation/qwindowsuiaaccessibility.cpp
index c7c0deab3f..32a57473ad 100644
--- a/src/plugins/platforms/windows/uiautomation/qwindowsuiaaccessibility.cpp
+++ b/src/plugins/platforms/windows/uiautomation/qwindowsuiaaccessibility.cpp
@@ -52,6 +52,8 @@
 #include <qpa/qplatformintegration.h>
 #include <QtWindowsUIAutomationSupport/private/qwindowsuiawrapper_p.h>
 
+#include <QtCore/private/qwinregistry_p.h>
+
 QT_BEGIN_NAMESPACE
 
 using namespace QWindowsUiAutomation;
@@ -85,12 +87,63 @@ bool QWindowsUiaAccessibility::handleWmGetObject(HWND hwnd, WPARAM wParam, LPARA
     return false;
 }
 
+// Retrieve sound name by checking the icon property of a message box
+// should it be the event object.
+static QString alertSound(const QObject *object)
+{
+    if (object->inherits("QMessageBox")) {
+        enum MessageBoxIcon { // Keep in sync with QMessageBox::Icon
+            Information = 1,
+            Warning = 2,
+            Critical = 3
+        };
+        switch (object->property("icon").toInt()) {
+        case Information:
+            return QStringLiteral("SystemAsterisk");
+        case Warning:
+            return QStringLiteral("SystemExclamation");
+        case Critical:
+            return QStringLiteral("SystemHand");
+        }
+    }
+    return QStringLiteral("SystemAsterisk");
+}
+
+static QString soundFileName(const QString &soundName)
+{
+    const QString key = QStringLiteral("AppEvents\\Schemes\\Apps\\.Default\\")
+        + soundName + QStringLiteral("\\.Current");
+    return QWinRegistryKey(HKEY_CURRENT_USER, key).stringValue(L"");
+}
+
+static void playSystemSound(const QString &soundName)
+{
+    if (!soundName.isEmpty() && !soundFileName(soundName).isEmpty()) {
+        PlaySound(reinterpret_cast<const wchar_t *>(soundName.utf16()), nullptr,
+                  SND_ALIAS | SND_ASYNC | SND_NODEFAULT | SND_NOWAIT);
+    }
+}
+
 // Handles accessibility update notifications.
 void QWindowsUiaAccessibility::notifyAccessibilityUpdate(QAccessibleEvent *event)
 {
     if (!event)
         return;
 
+    switch (event->type()) {
+        case QAccessible::PopupMenuStart:
+            playSystemSound(QStringLiteral("MenuPopup"));
+            break;
+        case QAccessible::MenuCommand:
+            playSystemSound(QStringLiteral("MenuCommand"));
+            break;
+        case QAccessible::Alert:
+            playSystemSound(alertSound(event->object()));
+            break;
+        default:
+            break;
+    }
+
     QAccessibleInterface *accessible = event->accessibleInterface();
     if (!isActive() || !accessible || !accessible->isValid())
         return;
diff --git a/src/testlib/qsignalspy.qdoc b/src/testlib/qsignalspy.qdoc
index d40c84907c..42e02ed601 100644
--- a/src/testlib/qsignalspy.qdoc
+++ b/src/testlib/qsignalspy.qdoc
@@ -102,9 +102,9 @@
     \since 5.14
 
     Constructs a new QSignalSpy that listens for emissions of the \a signal
-    from the QObject \a object. If QSignalSpy is not able to listen for a
-    valid signal (for example, because \a object is \nullptr or \a signal does
-    not denote a valid signal of \a object), an explanatory warning message
+    from the QObject \a obj. If QSignalSpy is not able to listen for a
+    valid signal (for example, because \a obj is \nullptr or \a signal does
+    not denote a valid signal of \a obj), an explanatory warning message
     will be output using qWarning() and subsequent calls to \c isValid() will
     return false.
 
diff --git a/src/tools/uic/python/pythonwriteimports.cpp b/src/tools/uic/python/pythonwriteimports.cpp
index be55696683..963244d450 100644
--- a/src/tools/uic/python/pythonwriteimports.cpp
+++ b/src/tools/uic/python/pythonwriteimports.cpp
@@ -41,7 +41,7 @@ QT_BEGIN_NAMESPACE
 static const char *standardImports =
 R"I(from PySide2.QtCore import (QCoreApplication, QMetaObject, QObject, QPoint,
     QRect, QSize, QUrl, Qt)
-from PySide2.QtGui import (QBrush, QColor, QConicalGradient, QFont,
+from PySide2.QtGui import (QBrush, QColor, QConicalGradient, QCursor, QFont,
     QFontDatabase, QIcon, QLinearGradient, QPalette, QPainter, QPixmap,
     QRadialGradient)
 from PySide2.QtWidgets import *
@@ -114,11 +114,29 @@ void WriteImports::acceptCustomWidget(DomCustomWidget *node)
     const auto &className = node->elementClass();
     if (className.contains(QLatin1String("::")))
         return; // Exclude namespaced names (just to make tests pass).
-    const QString &qtModule = qtModuleOf(node);
+    const QString &importModule = qtModuleOf(node);
     auto &output = m_uic->output();
-    if (!qtModule.isEmpty())
-        output << "from PySide2." << qtModule << ' ';
-    output << "import " << className << '\n';
+    // For starting importing PySide2 modules
+    if (!importModule.isEmpty()) {
+        output << "from ";
+        if (importModule.startsWith(QLatin1String("Qt")))
+            output << "PySide2.";
+        output << importModule;
+        if (!className.isEmpty())
+            output << " import " << className << "\n\n";
+    } else {
+        // When the elementHeader is not set, we know it's the continuation
+        // of a PySide2 import or a normal import of another module.
+        if (!node->elementHeader() || node->elementHeader()->text().isEmpty()) {
+            output << "import " << className << '\n';
+        } else { // When we do have elementHeader, we know it's a relative import.
+            QString modulePath = node->elementHeader()->text();
+            // '.h' is added by default on headers for <customwidget>
+            if (modulePath.endsWith(QLatin1String(".h")))
+                modulePath.chop(2);
+            output << "from " << modulePath << " import " << className << '\n';
+        }
+    }
 }
 
 } // namespace Python
diff --git a/src/widgets/dialogs/qfiledialog.cpp b/src/widgets/dialogs/qfiledialog.cpp
index ca2b783f55..e24d308d65 100644
--- a/src/widgets/dialogs/qfiledialog.cpp
+++ b/src/widgets/dialogs/qfiledialog.cpp
@@ -2378,7 +2378,8 @@ QList<QUrl> QFileDialog::getOpenFileUrls(QWidget *parent,
 
     This function is used to access local files on Qt for WebAssembly, where the web
     sandbox places restrictions on how such access may happen. Its implementation will
-    make the browser display a native file dialog, where the user makes the file selection.
+    make the browser display a native file dialog, where the user makes the file selection
+    based on the parameter \a nameFilter.
 
     It can also be used on other platforms, where it will fall back to using QFileDialog.
 
diff --git a/src/widgets/dialogs/qfilesystemmodel.cpp b/src/widgets/dialogs/qfilesystemmodel.cpp
index d658f7fe0c..a723c3a955 100644
--- a/src/widgets/dialogs/qfilesystemmodel.cpp
+++ b/src/widgets/dialogs/qfilesystemmodel.cpp
@@ -1213,7 +1213,8 @@ QMimeData *QFileSystemModel::mimeData(const QModelIndexList &indexes) const
 /*!
     Handles the \a data supplied by a drag and drop operation that ended with
     the given \a action over the row in the model specified by the \a row and
-    \a column and by the \a parent index.
+    \a column and by the \a parent index. Returns true if the operation was
+    successful.
 
     \sa supportedDropActions()
 */
diff --git a/src/widgets/kernel/qwidget.cpp b/src/widgets/kernel/qwidget.cpp
index 2160e54b8f..db3c269949 100644
--- a/src/widgets/kernel/qwidget.cpp
+++ b/src/widgets/kernel/qwidget.cpp
@@ -5952,7 +5952,11 @@ void QWidget::setWindowTitle(const QString &title)
     has been set, windowIcon() returns the application icon
     (QApplication::windowIcon()).
 
-    \sa windowTitle
+    \note On \macos, window icons represent the active document,
+    and will not be displayed unless a file path has also been
+    set using setFilePath.
+
+    \sa windowTitle, setFilePath
 */
 QIcon QWidget::windowIcon() const
 {
diff --git a/src/widgets/widgets/qscrollbar.cpp b/src/widgets/widgets/qscrollbar.cpp
index 34ea017279..2ce1d50c86 100644
--- a/src/widgets/widgets/qscrollbar.cpp
+++ b/src/widgets/widgets/qscrollbar.cpp
@@ -497,14 +497,20 @@ bool QScrollBar::event(QEvent *event)
 void QScrollBar::wheelEvent(QWheelEvent *event)
 {
     event->ignore();
+    bool horizontal = qAbs(event->angleDelta().x()) > qAbs(event->angleDelta().y());
+    // The vertical wheel can be used to scroll a horizontal scrollbar, but only if
+    // there is no simultaneous horizontal wheel movement.  This is to avoid chaotic
+    // scrolling on touchpads.
+    if (!horizontal && event->angleDelta().x() != 0 && orientation() == Qt::Horizontal)
+        return;
     // scrollbar is a special case - in vertical mode it reaches minimum
     // value in the upper position, however QSlider's minimum value is on
     // the bottom. So we need to invert the value, but since the scrollbar is
     // inverted by default, we need to invert the delta value only for the
     // horizontal orientation.
-    int delta = (orientation() == Qt::Horizontal ? -event->angleDelta().x() : event->angleDelta().y());
+    int delta = horizontal ? -event->angleDelta().x() : event->angleDelta().y();
     Q_D(QScrollBar);
-    if (d->scrollByDelta(orientation(), event->modifiers(), delta))
+    if (d->scrollByDelta(horizontal ? Qt::Horizontal : Qt::Vertical, event->modifiers(), delta))
         event->accept();
 
     if (event->phase() == Qt::ScrollBegin)