diff --git a/mkspecs/common/msvc-desktop.conf b/mkspecs/common/msvc-desktop.conf
index eec9e1f688..7ae53c7a1e 100644
--- a/mkspecs/common/msvc-desktop.conf
+++ b/mkspecs/common/msvc-desktop.conf
@@ -30,9 +30,10 @@ QMAKE_YACCFLAGS         = -d
 QMAKE_CFLAGS            = -nologo -Zc:wchar_t
 QMAKE_CFLAGS_WARN_ON    = -W3
 QMAKE_CFLAGS_WARN_OFF   = -W0
-QMAKE_CFLAGS_RELEASE    = -O2 -MD
-QMAKE_CFLAGS_RELEASE_WITH_DEBUGINFO += -O2 -MD -Zi
-QMAKE_CFLAGS_DEBUG      = -Zi -MDd
+# Patch: Make this build use static runtime library.
+QMAKE_CFLAGS_RELEASE    = -O2 -MT
+QMAKE_CFLAGS_RELEASE_WITH_DEBUGINFO += -O2 -MT -Zi
+QMAKE_CFLAGS_DEBUG      = -Zi -MTd
 QMAKE_CFLAGS_YACC       =
 QMAKE_CFLAGS_LTCG       = -GL
 QMAKE_CFLAGS_SSE2       = -arch:SSE2
diff --git a/src/corelib/io/qfsfileengine_win.cpp b/src/corelib/io/qfsfileengine_win.cpp
index 391fbcc519..d07802bb7a 100644
--- a/src/corelib/io/qfsfileengine_win.cpp
+++ b/src/corelib/io/qfsfileengine_win.cpp
@@ -427,11 +427,12 @@ qint64 QFSFileEnginePrivate::nativeWrite(const char *data, qint64 len)
 
     // Writing on Windows fails with ERROR_NO_SYSTEM_RESOURCES when
     // the chunks are too large, so we limit the block size to 32MB.
-    const DWORD blockSize = DWORD(qMin(bytesToWrite, qint64(32 * 1024 * 1024)));
     qint64 totalWritten = 0;
     do {
+        // Patch: backport critical bugfix from '683c9bc4a8' commit.
+        const DWORD currentBlockSize = DWORD(qMin(bytesToWrite, qint64(32 * 1024 * 1024)));
         DWORD bytesWritten;
-        if (!WriteFile(fileHandle, data + totalWritten, blockSize, &bytesWritten, NULL)) {
+        if (!WriteFile(fileHandle, data + totalWritten, currentBlockSize, &bytesWritten, NULL)) {
             if (totalWritten == 0) {
                 // Note: Only return error if the first WriteFile failed.
                 q->setError(QFile::WriteError, qt_error_string());
diff --git a/src/corelib/tools/qunicodetables.cpp b/src/corelib/tools/qunicodetables.cpp
index 14e4fd10aa..0619a176a7 100644
--- a/src/corelib/tools/qunicodetables.cpp
+++ b/src/corelib/tools/qunicodetables.cpp
@@ -6227,7 +6227,8 @@ static const Properties uc_properties[] = {
     { 1, 0, 0, 0, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 11, 0, 7, 4, 4, 21, 11 },
     { 0, 17, 230, 5, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 4, 4, 4, 21, 11 },
     { 18, 0, 0, 0, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 85, 0, 8, 8, 12, 11 },
-    { 25, 0, 0, 0, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 12, 17, 2 },
+    // Patch: Some bad characters appeared in ui in case 2 was here instead of 11.
+    { 25, 0, 0, 0, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 12, 17, 11 },
     { 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 14, 9, 11, 11 },
     { 3, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 14, 9, 11, 11 },
     { 3, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 14, 9, 11, 11 },
diff --git a/src/gui/kernel/qhighdpiscaling.cpp b/src/gui/kernel/qhighdpiscaling.cpp
index 2d00b9dce9..eeba86e936 100644
--- a/src/gui/kernel/qhighdpiscaling.cpp
+++ b/src/gui/kernel/qhighdpiscaling.cpp
@@ -51,6 +51,9 @@ static const char screenFactorsEnvVar[] = "QT_SCREEN_SCALE_FACTORS";
 
 static inline qreal initialGlobalScaleFactor()
 {
+    // Patch: Disable environment variable dpi scaling changing.
+    // It is not supported by Telegram Desktop :(
+    return 1.;
 
     qreal result = 1;
     if (qEnvironmentVariableIsSet(scaleFactorEnvVar)) {
diff --git a/src/gui/kernel/qplatformdialoghelper.h b/src/gui/kernel/qplatformdialoghelper.h
index 5b2f4ece77..790db46d25 100644
--- a/src/gui/kernel/qplatformdialoghelper.h
+++ b/src/gui/kernel/qplatformdialoghelper.h
@@ -386,6 +386,10 @@ public:
     virtual QUrl directory() const = 0;
     virtual void selectFile(const QUrl &filename) = 0;
     virtual QList<QUrl> selectedFiles() const = 0;
+
+    // Patch: Adding select-by-url for Windows file dialog.
+    virtual QByteArray selectedRemoteContent() const { return QByteArray(); }
+
     virtual void setFilter() = 0;
     virtual void selectNameFilter(const QString &filter) = 0;
     virtual QString selectedNameFilter() const = 0;
diff --git a/src/gui/kernel/qwindow.cpp b/src/gui/kernel/qwindow.cpp
index bcd29b6fe1..bcb0672f69 100644
--- a/src/gui/kernel/qwindow.cpp
+++ b/src/gui/kernel/qwindow.cpp
@@ -2525,7 +2525,8 @@ void QWindowPrivate::setCursor(const QCursor *newCursor)
 void QWindowPrivate::applyCursor()
 {
     Q_Q(QWindow);
-    if (platformWindow) {
+    // Patch: Fixing possible crash (crashdumps point on this code line).
+    if (platformWindow && q->screen() && q->screen()->handle()) {
         if (QPlatformCursor *platformCursor = q->screen()->handle()->cursor()) {
             QCursor *c = QGuiApplication::overrideCursor();
             if (!c && hasCursor)
diff --git a/src/gui/painting/qpaintengine_p.h b/src/gui/painting/qpaintengine_p.h
index 918c98997b..4158259743 100644
--- a/src/gui/painting/qpaintengine_p.h
+++ b/src/gui/painting/qpaintengine_p.h
@@ -80,8 +80,18 @@ public:
         if (hasSystemTransform) {
             if (systemTransform.type() <= QTransform::TxTranslate)
                 systemClip.translate(qRound(systemTransform.dx()), qRound(systemTransform.dy()));
-            else
+            // Patch: Transform the system clip region back from device pixels to device-independent pixels before
+            // applying systemTransform, which already has transform from device-independent pixels to device pixels.
+            else {
+#ifdef Q_OS_MAC
+                QTransform scaleTransform;
+                const qreal invDevicePixelRatio = 1. / pdev->devicePixelRatio();
+                scaleTransform.scale(invDevicePixelRatio, invDevicePixelRatio);
+                systemClip = systemTransform.map(scaleTransform.map(systemClip));
+#else
                 systemClip = systemTransform.map(systemClip);
+#endif
+            }
         }
 
         // Make sure we're inside the viewport.
diff --git a/src/gui/text/qtextengine_p.h b/src/gui/text/qtextengine_p.h
index 7e507bba2d..936e7a92cb 100644
--- a/src/gui/text/qtextengine_p.h
+++ b/src/gui/text/qtextengine_p.h
@@ -283,7 +283,8 @@ private:
 
 struct QScriptItem;
 /// Internal QTextItem
-class QTextItemInt : public QTextItem
+// Patch: Enable access to QTextItemInt in .dll for WinRT build.
+class Q_GUI_EXPORT QTextItemInt : public QTextItem
 {
 public:
     inline QTextItemInt()
diff --git a/src/gui/text/qtextlayout.cpp b/src/gui/text/qtextlayout.cpp
index aca475a581..5fa0be2c45 100644
--- a/src/gui/text/qtextlayout.cpp
+++ b/src/gui/text/qtextlayout.cpp
@@ -694,6 +694,9 @@ int QTextLayout::nextCursorPosition(int oldPos, CursorMode mode) const
         while (oldPos < len && !attributes[oldPos].graphemeBoundary)
             oldPos++;
     } else {
+        // Patch: Skip to the end of the current word, not to the start of the next one.
+        while (oldPos < len && attributes[oldPos].whiteSpace)
+            oldPos++;
         if (oldPos < len && d->atWordSeparator(oldPos)) {
             oldPos++;
             while (oldPos < len && d->atWordSeparator(oldPos))
@@ -702,8 +705,9 @@ int QTextLayout::nextCursorPosition(int oldPos, CursorMode mode) const
             while (oldPos < len && !attributes[oldPos].whiteSpace && !d->atWordSeparator(oldPos))
                 oldPos++;
         }
-        while (oldPos < len && attributes[oldPos].whiteSpace)
-            oldPos++;
+        // Patch: Skip to the end of the current word, not to the start of the next one.
+        //while (oldPos < len && attributes[oldPos].whiteSpace)
+        //    oldPos++;
     }
 
     return oldPos;
@@ -1645,6 +1649,9 @@ namespace {
         int currentPosition;
         glyph_t previousGlyph;
 
+        // Patch: Fix a crash in right bearing calculation.
+        QFontEngine *previousGlyphFontEngine;
+
         QFixed minw;
         QFixed softHyphenWidth;
         QFixed rightBearing;
@@ -1677,13 +1684,19 @@ namespace {
             if (currentPosition > 0 &&
                 logClusters[currentPosition - 1] < glyphs.numGlyphs) {
                 previousGlyph = currentGlyph(); // needed to calculate right bearing later
+
+                // Patch: Fix a crash in right bearing calculation.
+                previousGlyphFontEngine = fontEngine;
             }
         }
 
-        inline void calculateRightBearing(glyph_t glyph)
+        // Patch: Fix a crash in right bearing calculation.
+        inline void calculateRightBearing(QFontEngine *engine, glyph_t glyph)
         {
             qreal rb;
-            fontEngine->getGlyphBearings(glyph, 0, &rb);
+
+            // Patch: Fix a crash in right bearing calculation.
+            engine->getGlyphBearings(glyph, 0, &rb);
 
             // We only care about negative right bearings, so we limit the range
             // of the bearing here so that we can assume it's negative in the rest
@@ -1696,13 +1709,16 @@ namespace {
         {
             if (currentPosition <= 0)
                 return;
-            calculateRightBearing(currentGlyph());
+
+            // Patch: Fix a crash in right bearing calculation.
+            calculateRightBearing(fontEngine, currentGlyph());
         }
 
         inline void calculateRightBearingForPreviousGlyph()
         {
             if (previousGlyph > 0)
-                calculateRightBearing(previousGlyph);
+                // Patch: Fix a crash in right bearing calculation.
+                calculateRightBearing(previousGlyphFontEngine, previousGlyph);
         }
 
         static const QFixed RightBearingNotCalculated;
diff --git a/src/gui/text/qtextlayout.h b/src/gui/text/qtextlayout.h
index f74d4d4229..8ad672c9fe 100644
--- a/src/gui/text/qtextlayout.h
+++ b/src/gui/text/qtextlayout.h
@@ -196,6 +196,9 @@ private:
                                QRectF *brect, int tabstops, int* tabarray, int tabarraylen,
                                QPainter *painter);
     QTextEngine *d;
+
+    // Patch: Allow access to private constructor.
+    friend class TextBlock;
 };
 
 
diff --git a/src/network/access/qhttpnetworkconnection.cpp b/src/network/access/qhttpnetworkconnection.cpp
index c4cb8e65c0..45793e364f 100644
--- a/src/network/access/qhttpnetworkconnection.cpp
+++ b/src/network/access/qhttpnetworkconnection.cpp
@@ -110,6 +110,8 @@ QHttpNetworkConnectionPrivate::~QHttpNetworkConnectionPrivate()
 {
     for (int i = 0; i < channelCount; ++i) {
         if (channels[i].socket) {
+            // Patch: backport critical bugfix from '4f959b6b30' commit.
+            QObject::disconnect(channels[i].socket, Q_NULLPTR, &channels[i], Q_NULLPTR);
             channels[i].socket->close();
             delete channels[i].socket;
         }
diff --git a/src/network/socket/qnativesocketengine_win.cpp b/src/network/socket/qnativesocketengine_win.cpp
index 41834b21ae..8cdf4ab145 100644
--- a/src/network/socket/qnativesocketengine_win.cpp
+++ b/src/network/socket/qnativesocketengine_win.cpp
@@ -675,6 +675,13 @@ bool QNativeSocketEnginePrivate::nativeConnect(const QHostAddress &address, quin
                             errorDetected = true;
                             break;
                         }
+                        // Patch: Handle network unreachable the same as host unreachable.
+                        if (value == WSAENETUNREACH) {
+                            setError(QAbstractSocket::NetworkError, NetworkUnreachableErrorString);
+                            socketState = QAbstractSocket::UnconnectedState;
+                            errorDetected = true;
+                            break;
+                        }
                         if (value == WSAEADDRNOTAVAIL) {
                             setError(QAbstractSocket::NetworkError, AddressNotAvailableErrorString);
                             socketState = QAbstractSocket::UnconnectedState;
diff --git a/src/platformsupport/dbustray/qdbustrayicon.cpp b/src/platformsupport/dbustray/qdbustrayicon.cpp
index 4d6e70720d..9bdb0beb67 100644
--- a/src/platformsupport/dbustray/qdbustrayicon.cpp
+++ b/src/platformsupport/dbustray/qdbustrayicon.cpp
@@ -58,9 +58,18 @@ QT_BEGIN_NAMESPACE
 
 Q_LOGGING_CATEGORY(qLcTray, "qt.qpa.tray")
 
+static QString cachePath()
+{
+    QString xdgCache = QString::fromUtf8(getenv("XDG_CACHE_HOME"));
+    if (xdgCache.isEmpty()) {
+        xdgCache = QDir::cleanPath(QDir::homePath() + QStringLiteral("/.cache"));
+    }
+    return xdgCache;
+}
+
 static const QString KDEItemFormat = QStringLiteral("org.kde.StatusNotifierItem-%1-%2");
 static const QString KDEWatcherService = QStringLiteral("org.kde.StatusNotifierWatcher");
-static const QString TempFileTemplate =  QDir::tempPath() + QStringLiteral("/qt-trayicon-XXXXXX.png");
+static const QString TempFileTemplate = cachePath() + QStringLiteral("/qt-trayicon-XXXXXX.png");
 static const QString XdgNotificationService = QStringLiteral("org.freedesktop.Notifications");
 static const QString XdgNotificationPath = QStringLiteral("/org/freedesktop/Notifications");
 static const QString DefaultAction = QStringLiteral("default");
@@ -151,6 +160,12 @@ QTemporaryFile *QDBusTrayIcon::tempIcon(const QIcon &icon)
         uint pid = session.interface()->servicePid(KDEWatcherService).value();
         QString processName = QLockFilePrivate::processNameByPid(pid);
         necessary = processName.endsWith(QStringLiteral("indicator-application-service"));
+        if (!necessary) {
+            QString xdgDesktop = QString::fromUtf8(getenv("XDG_CURRENT_DESKTOP"));
+            QStringList desktops = xdgDesktop.toLower().split(QLatin1Char(':'));
+            necessary = desktops.contains(QStringLiteral("unity")) ||
+                        desktops.contains(QStringLiteral("ubuntu"));
+        }
         necessity_checked = true;
     }
     if (!necessary)
diff --git a/src/platformsupport/fontdatabases/basic/qbasicfontdatabase.cpp b/src/platformsupport/fontdatabases/basic/qbasicfontdatabase.cpp
index 728b166b71..1dc64593e1 100644
--- a/src/platformsupport/fontdatabases/basic/qbasicfontdatabase.cpp
+++ b/src/platformsupport/fontdatabases/basic/qbasicfontdatabase.cpp
@@ -172,6 +172,79 @@ void QBasicFontDatabase::releaseHandle(void *handle)
 
 extern FT_Library qt_getFreetype();
 
+// Patch: Enable Open Sans Semibold font family reading.
+// Copied from freetype with some modifications.
+
+#ifndef FT_PARAM_TAG_IGNORE_PREFERRED_FAMILY
+#define FT_PARAM_TAG_IGNORE_PREFERRED_FAMILY FT_MAKE_TAG('i', 'g', 'p', 'f')
+#endif
+
+#ifndef FT_PARAM_TAG_IGNORE_PREFERRED_SUBFAMILY
+#define FT_PARAM_TAG_IGNORE_PREFERRED_SUBFAMILY FT_MAKE_TAG('i', 'g', 'p', 's')
+#endif
+
+/* there's a Mac-specific extended implementation of FT_New_Face() */
+/* in src/base/ftmac.c                                             */
+
+#if !defined( FT_MACINTOSH ) || defined( DARWIN_NO_CARBON )
+
+/* documentation is in freetype.h */
+
+FT_Error __ft_New_Face(FT_Library library, const char* pathname, FT_Long face_index, FT_Face *aface) {
+    FT_Open_Args args;
+
+    /* test for valid `library' and `aface' delayed to FT_Open_Face() */
+    if (!pathname)
+        return FT_Err_Invalid_Argument;
+
+    FT_Parameter params[2];
+    params[0].tag = FT_PARAM_TAG_IGNORE_PREFERRED_FAMILY;
+    params[0].data = 0;
+    params[1].tag = FT_PARAM_TAG_IGNORE_PREFERRED_SUBFAMILY;
+    params[1].data = 0;
+    args.flags = FT_OPEN_PATHNAME | FT_OPEN_PARAMS;
+    args.pathname = (char*)pathname;
+    args.stream = NULL;
+    args.num_params = 2;
+    args.params = params;
+
+    return FT_Open_Face(library, &args, face_index, aface);
+}
+
+#else
+
+FT_Error __ft_New_Face(FT_Library library, const char* pathname, FT_Long face_index, FT_Face *aface) {
+    return FT_New_Face(library, pathname, face_index, aface);
+}
+
+#endif  /* defined( FT_MACINTOSH ) && !defined( DARWIN_NO_CARBON ) */
+
+/* documentation is in freetype.h */
+
+FT_Error __ft_New_Memory_Face(FT_Library library, const FT_Byte* file_base, FT_Long file_size, FT_Long face_index, FT_Face *aface) {
+    FT_Open_Args  args;
+
+    /* test for valid `library' and `face' delayed to FT_Open_Face() */
+    if (!file_base)
+        return FT_Err_Invalid_Argument;
+
+    FT_Parameter params[2];
+    params[0].tag = FT_PARAM_TAG_IGNORE_PREFERRED_FAMILY;
+    params[0].data = 0;
+    params[1].tag = FT_PARAM_TAG_IGNORE_PREFERRED_SUBFAMILY;
+    params[1].data = 0;
+    args.flags = FT_OPEN_MEMORY | FT_OPEN_PARAMS;
+    args.memory_base = file_base;
+    args.memory_size = file_size;
+    args.stream = NULL;
+    args.num_params = 2;
+    args.params = params;
+
+    return FT_Open_Face(library, &args, face_index, aface);
+}
+
+// end
+
 QStringList QBasicFontDatabase::addTTFile(const QByteArray &fontData, const QByteArray &file)
 {
     FT_Library library = qt_getFreetype();
@@ -183,9 +256,11 @@ QStringList QBasicFontDatabase::addTTFile(const QByteArray &fontData, const QByt
         FT_Face face;
         FT_Error error;
         if (!fontData.isEmpty()) {
-            error = FT_New_Memory_Face(library, (const FT_Byte *)fontData.constData(), fontData.size(), index, &face);
+            // Patch: Enable Open Sans Semibold font family reading.
+            error = __ft_New_Memory_Face(library, (const FT_Byte *)fontData.constData(), fontData.size(), index, &face);
         } else {
-            error = FT_New_Face(library, file.constData(), index, &face);
+            // Patch: Enable Open Sans Semibold font family reading.
+            error = __ft_New_Face(library, file.constData(), index, &face);
         }
         if (error != FT_Err_Ok) {
             qDebug() << "FT_New_Face failed with index" << index << ':' << hex << error;
diff --git a/src/platformsupport/fontdatabases/fontconfig/qfontconfigdatabase.cpp b/src/platformsupport/fontdatabases/fontconfig/qfontconfigdatabase.cpp
index 8ebabf3419..7bb8abd0d0 100644
--- a/src/platformsupport/fontdatabases/fontconfig/qfontconfigdatabase.cpp
+++ b/src/platformsupport/fontdatabases/fontconfig/qfontconfigdatabase.cpp
@@ -375,6 +375,17 @@ static void populateFromPattern(FcPattern *pattern)
 
     familyName = QString::fromUtf8((const char *)value);
 
+    // Patch: Enable Open Sans Semibold font family reading.
+    if (familyName == QLatin1String("Open Sans")) {
+        FcChar8 *styl = 0;
+        if (FcPatternGetString(pattern, FC_STYLE, 0, &styl) == FcResultMatch) {
+            QString style = QString::fromUtf8(reinterpret_cast<const char *>(styl));
+            if (style == QLatin1String("Semibold")) {
+                familyName.append(QChar(QChar::Space)).append(style);
+            }
+        }
+    }
+
     slant_value = FC_SLANT_ROMAN;
     weight_value = FC_WEIGHT_REGULAR;
     spacing_value = FC_PROPORTIONAL;
@@ -718,7 +729,19 @@ QStringList QFontconfigDatabase::fallbacksForFamily(const QString &family, QFont
             if (FcPatternGetString(fontSet->fonts[i], FC_FAMILY, 0, &value) != FcResultMatch)
                 continue;
             //         capitalize(value);
-            const QString familyName = QString::fromUtf8((const char *)value);
+
+            // Patch: Enable Open Sans Semibold font family reading.
+            QString familyName = QString::fromUtf8((const char *)value);
+            if (familyName == QLatin1String("Open Sans")) {
+                FcChar8 *styl = 0;
+                if (FcPatternGetString(fontSet->fonts[i], FC_STYLE, 0, &styl) == FcResultMatch) {
+                    QString style = QString::fromUtf8(reinterpret_cast<const char *>(styl));
+                    if (style == QLatin1String("Semibold")) {
+                        familyName.append(QChar(QChar::Space)).append(style);
+                    }
+                }
+            }
+
             const QString familyNameCF = familyName.toCaseFolded();
             if (!duplicates.contains(familyNameCF)) {
                 fallbackFamilies << familyName;
@@ -784,6 +807,18 @@ QStringList QFontconfigDatabase::addApplicationFont(const QByteArray &fontData,
         FcChar8 *fam = 0;
         if (FcPatternGetString(pattern, FC_FAMILY, 0, &fam) == FcResultMatch) {
             QString family = QString::fromUtf8(reinterpret_cast<const char *>(fam));
+
+            // Patch: Enable Open Sans Semibold font family reading.
+            if (family == QLatin1String("Open Sans")) {
+                FcChar8 *styl = 0;
+                if (FcPatternGetString(pattern, FC_STYLE, 0, &styl) == FcResultMatch) {
+                    QString style = QString::fromUtf8(reinterpret_cast<const char *>(styl));
+                    if (style == QLatin1String("Semibold")) {
+                        family.append(QChar(QChar::Space)).append(style);
+                    }
+                }
+            }
+
             families << family;
         }
         populateFromPattern(pattern);
diff --git a/src/platformsupport/fontdatabases/mac/qcoretextfontdatabase.mm b/src/platformsupport/fontdatabases/mac/qcoretextfontdatabase.mm
index 566abf2126..5c5fde9813 100644
--- a/src/platformsupport/fontdatabases/mac/qcoretextfontdatabase.mm
+++ b/src/platformsupport/fontdatabases/mac/qcoretextfontdatabase.mm
@@ -265,6 +265,13 @@ static void getFontDescription(CTFontDescriptorRef font, FontDescription *fd)
 
     fd->foundryName = QStringLiteral("CoreText");
     fd->familyName = (CFStringRef) CTFontDescriptorCopyAttribute(font, kCTFontFamilyNameAttribute);
+
+    // Patch: Enable Open Sans Semibold font family reading.
+    QCFString _displayName = (CFStringRef) CTFontDescriptorCopyAttribute(font, kCTFontDisplayNameAttribute);
+    if (_displayName == QStringLiteral("Open Sans Semibold")) {
+        fd->familyName = _displayName;
+    }
+
     fd->styleName = (CFStringRef)CTFontDescriptorCopyAttribute(font, kCTFontStyleNameAttribute);
     fd->weight = QFont::Normal;
     fd->style = QFont::StyleNormal;
@@ -300,9 +307,10 @@ static void getFontDescription(CTFontDescriptorRef font, FontDescription *fd)
 
     if (styles) {
         if (CFNumberRef weightValue = (CFNumberRef) CFDictionaryGetValue(styles, kCTFontWeightTrait)) {
-            float normalizedWeight;
-            if (CFNumberGetValue(weightValue, kCFNumberFloatType, &normalizedWeight))
-                fd->weight = QCoreTextFontEngine::qtWeightFromCFWeight(normalizedWeight);
+            // Patch: backport bugfix from 'b64ea4a3ab' commit.
+            double normalizedWeight;
+            if (CFNumberGetValue(weightValue, kCFNumberFloat64Type, &normalizedWeight))
+                fd->weight = QCoreTextFontEngine::qtWeightFromCFWeight(float(normalizedWeight));
         }
         if (CFNumberRef italic = (CFNumberRef) CFDictionaryGetValue(styles, kCTFontSlantTrait)) {
             double d;
diff --git a/src/platformsupport/fontdatabases/mac/qfontengine_coretext.mm b/src/platformsupport/fontdatabases/mac/qfontengine_coretext.mm
index 7b459584ea..2ed2fd9b3b 100644
--- a/src/platformsupport/fontdatabases/mac/qfontengine_coretext.mm
+++ b/src/platformsupport/fontdatabases/mac/qfontengine_coretext.mm
@@ -764,7 +764,8 @@ void QCoreTextFontEngine::getUnscaledGlyph(glyph_t glyph, QPainterPath *path, gl
 
 QFixed QCoreTextFontEngine::emSquareSize() const
 {
-    return QFixed::QFixed(int(CTFontGetUnitsPerEm(ctfont)));
+    // Patch: Fix build for Xcode 9.3.1.
+    return QFixed(int(CTFontGetUnitsPerEm(ctfont)));
 }
 
 QFontEngine *QCoreTextFontEngine::cloneWithSize(qreal pixelSize) const
diff --git a/src/plugins/platforminputcontexts/compose/compose.pro b/src/plugins/platforminputcontexts/compose/compose.pro
index 86bdd4729b..9b9c8ded08 100644
--- a/src/plugins/platforminputcontexts/compose/compose.pro
+++ b/src/plugins/platforminputcontexts/compose/compose.pro
@@ -15,7 +15,8 @@ HEADERS += $$PWD/qcomposeplatforminputcontext.h \
 contains(QT_CONFIG, xkbcommon-qt): {
     # dont't need x11 dependency for compose key plugin
     QT_CONFIG -= use-xkbcommon-x11support
-    include(../../../3rdparty/xkbcommon.pri)
+    # Patch: Adding fcitx input context plugin to our static build.
+    #include(../../../3rdparty/xkbcommon.pri)
 } else {
     LIBS += $$QMAKE_LIBS_XKBCOMMON
     QMAKE_CXXFLAGS += $$QMAKE_CFLAGS_XKBCOMMON
diff --git a/src/plugins/platforminputcontexts/compose/qcomposeplatforminputcontext.cpp b/src/plugins/platforminputcontexts/compose/qcomposeplatforminputcontext.cpp
index d1bea9af23..36a15a6473 100644
--- a/src/plugins/platforminputcontexts/compose/qcomposeplatforminputcontext.cpp
+++ b/src/plugins/platforminputcontexts/compose/qcomposeplatforminputcontext.cpp
@@ -232,6 +232,12 @@ bool QComposeInputContext::checkComposeTable()
 
 void QComposeInputContext::commitText(uint character) const
 {
+    // Patch: Crash fix when not focused widget still receives input events.
+    if (!m_focusObject) {
+        qWarning("QComposeInputContext::commitText: m_focusObject == nullptr, cannot commit text");
+        return;
+    }
+
     QInputMethodEvent event;
     event.setCommitString(QChar(character));
     QCoreApplication::sendEvent(m_focusObject, &event);
diff --git a/src/plugins/platforminputcontexts/platforminputcontexts.pro b/src/plugins/platforminputcontexts/platforminputcontexts.pro
index faea54b874..fe4a837511 100644
--- a/src/plugins/platforminputcontexts/platforminputcontexts.pro
+++ b/src/plugins/platforminputcontexts/platforminputcontexts.pro
@@ -1,7 +1,8 @@
 TEMPLATE = subdirs
 
 qtHaveModule(dbus) {
-!mac:!win32:SUBDIRS += ibus
+# Patch: Adding fcitx/hime/nimf input context plugin to our static build.
+!mac:!win32:SUBDIRS += ibus fcitx hime nimf
 }
 
 contains(QT_CONFIG, xcb-plugin): SUBDIRS += compose
diff --git a/src/plugins/platforms/cocoa/qcocoaapplicationdelegate.mm b/src/plugins/platforms/cocoa/qcocoaapplicationdelegate.mm
index caa8884661..9dc3bc1661 100644
--- a/src/plugins/platforms/cocoa/qcocoaapplicationdelegate.mm
+++ b/src/plugins/platforms/cocoa/qcocoaapplicationdelegate.mm
@@ -210,7 +210,8 @@ QT_END_NAMESPACE
     if (reflectionDelegate) {
         if ([reflectionDelegate respondsToSelector:@selector(applicationShouldTerminate:)])
             return [reflectionDelegate applicationShouldTerminate:sender];
-        return NSTerminateNow;
+        // Patch: Don't terminate if reflectionDelegate does not respond to that selector, just use the default.
+        //return NSTerminateNow;
     }
 
     if ([self canQuit]) {
@@ -287,11 +288,15 @@ QT_END_NAMESPACE
 
 - (void)applicationDidFinishLaunching:(NSNotification *)aNotification
 {
+    // Patch: We need to catch that notification in delegate.
+    if (reflectionDelegate
+        && [reflectionDelegate respondsToSelector:@selector(applicationDidFinishLaunching:)])
+        [reflectionDelegate applicationDidFinishLaunching:aNotification];
+
     Q_UNUSED(aNotification);
     inLaunch = false;
     // qt_release_apple_event_handler();
 
-
     // Insert code here to initialize your application
 }
 
diff --git a/src/plugins/platforms/cocoa/qcocoabackingstore.h b/src/plugins/platforms/cocoa/qcocoabackingstore.h
index 934f68ad18..3ece6984ac 100644
--- a/src/plugins/platforms/cocoa/qcocoabackingstore.h
+++ b/src/plugins/platforms/cocoa/qcocoabackingstore.h
@@ -64,6 +64,9 @@ public:
 private:
     QImage m_qImage;
     QSize m_requestedSize;
+
+    // Patch: Optimize redraw - don't clear image if it will be fully redrawn.
+    bool m_qImageNeedsClear;
 };
 
 QT_END_NAMESPACE
diff --git a/src/plugins/platforms/cocoa/qcocoabackingstore.mm b/src/plugins/platforms/cocoa/qcocoabackingstore.mm
index ca92103826..f27ea15bad 100644
--- a/src/plugins/platforms/cocoa/qcocoabackingstore.mm
+++ b/src/plugins/platforms/cocoa/qcocoabackingstore.mm
@@ -38,7 +38,8 @@
 QT_BEGIN_NAMESPACE
 
 QCocoaBackingStore::QCocoaBackingStore(QWindow *window)
-    : QPlatformBackingStore(window)
+    // Patch: Optimize redraw - don't clear image if it will be fully redrawn.
+    : QPlatformBackingStore(window), m_qImageNeedsClear(false)
 {
 }
 
@@ -59,9 +60,12 @@ QPaintDevice *QCocoaBackingStore::paintDevice()
     if (m_qImage.size() != effectiveBufferSize) {
         QImage::Format format = (window()->format().hasAlpha() || cocoaWindow->m_drawContentBorderGradient)
                 ? QImage::Format_ARGB32_Premultiplied : QImage::Format_RGB32;
+
+        // Patch: Optimize redraw - don't clear image if it will be fully redrawn.
+        m_qImageNeedsClear = window()->requestedFormat().hasAlpha() || cocoaWindow->m_drawContentBorderGradient;
         m_qImage = QImage(effectiveBufferSize, format);
         m_qImage.setDevicePixelRatio(windowDevicePixelRatio);
-        if (format == QImage::Format_ARGB32_Premultiplied)
+        if (m_qImageNeedsClear)
             m_qImage.fill(Qt::transparent);
     }
     return &m_qImage;
@@ -100,7 +104,8 @@ bool QCocoaBackingStore::scroll(const QRegion &area, int dx, int dy)
 
 void QCocoaBackingStore::beginPaint(const QRegion &region)
 {
-    if (m_qImage.hasAlphaChannel()) {
+    // Patch: Optimize redraw - don't clear image if it will be fully redrawn.
+    if (m_qImageNeedsClear && m_qImage.hasAlphaChannel()) {
         QPainter p(&m_qImage);
         p.setCompositionMode(QPainter::CompositionMode_Source);
         const QVector<QRect> rects = region.rects();
diff --git a/src/plugins/platforms/cocoa/qcocoahelpers.mm b/src/plugins/platforms/cocoa/qcocoahelpers.mm
index 058209da7e..6af61e7dab 100644
--- a/src/plugins/platforms/cocoa/qcocoahelpers.mm
+++ b/src/plugins/platforms/cocoa/qcocoahelpers.mm
@@ -546,9 +546,9 @@ OSStatus qt_mac_drawCGImage(CGContextRef inContext, const CGRect *inBounds, CGIm
     // Verbatim copy if HIViewDrawCGImage (as shown on Carbon-Dev)
     OSStatus err = noErr;
 
-    require_action(inContext != NULL, InvalidContext, err = paramErr);
-    require_action(inBounds != NULL, InvalidBounds, err = paramErr);
-    require_action(inImage != NULL, InvalidImage, err = paramErr);
+//    require_action(inContext != NULL, InvalidContext, err = paramErr);
+//    require_action(inBounds != NULL, InvalidBounds, err = paramErr);
+//    require_action(inImage != NULL, InvalidImage, err = paramErr);
 
     CGContextSaveGState( inContext );
     CGContextTranslateCTM (inContext, 0, inBounds->origin.y + CGRectGetMaxY(*inBounds));
@@ -557,9 +557,9 @@ OSStatus qt_mac_drawCGImage(CGContextRef inContext, const CGRect *inBounds, CGIm
     CGContextDrawImage(inContext, *inBounds, inImage);
 
     CGContextRestoreGState(inContext);
-InvalidImage:
-InvalidBounds:
-InvalidContext:
+//InvalidImage:
+//InvalidBounds:
+//InvalidContext:
         return err;
 }
 
diff --git a/src/plugins/platforms/cocoa/qcocoakeymapper.mm b/src/plugins/platforms/cocoa/qcocoakeymapper.mm
index c2d206fb45..9b9739862d 100644
--- a/src/plugins/platforms/cocoa/qcocoakeymapper.mm
+++ b/src/plugins/platforms/cocoa/qcocoakeymapper.mm
@@ -384,6 +384,12 @@ bool QCocoaKeyMapper::updateKeyboard()
         keyboardInputLocale = QLocale::c();
         keyboardInputDirection = Qt::LeftToRight;
     }
+
+    // Patch: Fix layout-independent global shortcuts.
+    const auto newMode = keyboard_mode;
+    deleteLayouts();
+    keyboard_mode = newMode;
+
     return true;
 }
 
@@ -466,7 +472,8 @@ QList<int> QCocoaKeyMapper::possibleKeys(const QKeyEvent *event) const
         Qt::KeyboardModifiers neededMods = ModsTbl[i];
         int key = kbItem->qtKey[i];
         if (key && key != baseKey && ((keyMods & neededMods) == neededMods)) {
-            ret << int(key + (keyMods & ~neededMods));
+            // Patch: Fix layout-independent global shortcuts.
+            ret << int(key + neededMods);
         }
     }
     return ret;
diff --git a/src/plugins/platforms/cocoa/qcocoasystemtrayicon.mm b/src/plugins/platforms/cocoa/qcocoasystemtrayicon.mm
index 8152c57ffd..87ba2f3f72 100644
--- a/src/plugins/platforms/cocoa/qcocoasystemtrayicon.mm
+++ b/src/plugins/platforms/cocoa/qcocoasystemtrayicon.mm
@@ -94,6 +94,8 @@ QT_USE_NAMESPACE
     QCocoaSystemTrayIcon *systray;
     NSStatusItem *item;
     QCocoaMenu *menu;
+    // Patch: Create a rich os x tray icon (pixel-perfect, theme switching).
+    bool menuVisible, iconSelected;
     QIcon icon;
     QT_MANGLE_NAMESPACE(QNSImageView) *imageCell;
 }
@@ -197,7 +199,9 @@ void QCocoaSystemTrayIcon::updateIcon(const QIcon &icon)
     // (device independent pixels). The menu height on past and
     // current OS X versions is 22 points. Provide some future-proofing
     // by deriving the icon height from the menu height.
-    const int padding = 4;
+
+    // Patch: Create a rich os x tray icon (pixel-perfect, theme switching).
+    const int padding = 0;
     const int menuHeight = [[NSStatusBar systemStatusBar] thickness];
     const int maxImageHeight = menuHeight - padding;
 
@@ -207,8 +211,11 @@ void QCocoaSystemTrayIcon::updateIcon(const QIcon &icon)
     // devicePixelRatio for the "best" screen on the system.
     qreal devicePixelRatio = qApp->devicePixelRatio();
     const int maxPixmapHeight = maxImageHeight * devicePixelRatio;
+
+    // Patch: Create a rich os x tray icon (pixel-perfect, theme switching).
+    const QIcon::Mode mode = m_sys->item->iconSelected ? QIcon::Selected : QIcon::Normal;
     QSize selectedSize;
-    Q_FOREACH (const QSize& size, sortByHeight(icon.availableSizes())) {
+    Q_FOREACH (const QSize& size, sortByHeight(icon.availableSizes(mode))) {
         // Select a pixmap based on the height. We want the largest pixmap
         // with a height smaller or equal to maxPixmapHeight. The pixmap
         // may rectangular; assume it has a reasonable size. If there is
@@ -224,9 +231,9 @@ void QCocoaSystemTrayIcon::updateIcon(const QIcon &icon)
 
     // Handle SVG icons, which do not return anything for availableSizes().
     if (!selectedSize.isValid())
-        selectedSize = icon.actualSize(QSize(maxPixmapHeight, maxPixmapHeight));
+        selectedSize = icon.actualSize(QSize(maxPixmapHeight, maxPixmapHeight), mode);
 
-    QPixmap pixmap = icon.pixmap(selectedSize);
+    QPixmap pixmap = icon.pixmap(selectedSize, mode);
 
     // Draw a low-resolution icon if there is not enough pixels for a retina
     // icon. This prevents showing a small icon on retina displays.
@@ -374,6 +381,11 @@ QT_END_NAMESPACE
     Q_UNUSED(notification);
     down = NO;
 
+    // Patch: Create a rich os x tray icon (pixel-perfect, theme switching).
+    parent->iconSelected = false;
+    parent->systray->updateIcon(parent->icon);
+    parent->menuVisible = false;
+
     [self setNeedsDisplay:YES];
 }
 
@@ -383,6 +395,10 @@ QT_END_NAMESPACE
     int clickCount = [mouseEvent clickCount];
     [self setNeedsDisplay:YES];
 
+    // Patch: Create a rich os x tray icon (pixel-perfect, theme switching).
+    parent->iconSelected = (clickCount != 2) && parent->menu;
+    parent->systray->updateIcon(parent->icon);
+
     if (clickCount == 2) {
         [self menuTrackingDone:nil];
         [parent doubleClickSelector:self];
@@ -399,6 +415,11 @@ QT_END_NAMESPACE
 -(void)mouseUp:(NSEvent *)mouseEvent
 {
     Q_UNUSED(mouseEvent);
+
+    // Patch: Create a rich os x tray icon (pixel-perfect, theme switching).
+    parent->iconSelected = false;
+    parent->systray->updateIcon(parent->icon);
+
     [self menuTrackingDone:nil];
 }
 
@@ -410,6 +431,11 @@ QT_END_NAMESPACE
 -(void)rightMouseUp:(NSEvent *)mouseEvent
 {
     Q_UNUSED(mouseEvent);
+
+    // Patch: Create a rich os x tray icon (pixel-perfect, theme switching).
+    parent->iconSelected = false;
+    parent->systray->updateIcon(parent->icon);
+
     [self menuTrackingDone:nil];
 }
 
@@ -425,7 +451,8 @@ QT_END_NAMESPACE
 }
 
 -(void)drawRect:(NSRect)rect {
-    [[parent item] drawStatusBarBackgroundInRect:rect withHighlight:down];
+    // Patch: Create a rich os x tray icon (pixel-perfect, theme switching).
+    [[parent item] drawStatusBarBackgroundInRect:rect withHighlight:parent->menu ? down : NO];
     [super drawRect:rect];
 }
 @end
@@ -438,6 +465,10 @@ QT_END_NAMESPACE
     if (self) {
         item = [[[NSStatusBar systemStatusBar] statusItemWithLength:NSSquareStatusItemLength] retain];
         menu = 0;
+
+        // Patch: Create a rich os x tray icon (pixel-perfect, theme switching).
+        menuVisible = false;
+
         systray = sys;
         imageCell = [[QNSImageView alloc] initWithParent:self];
         [item setView: imageCell];
@@ -448,6 +479,11 @@ QT_END_NAMESPACE
 -(void)dealloc {
     [[NSStatusBar systemStatusBar] removeStatusItem:item];
     [[NSNotificationCenter defaultCenter] removeObserver:imageCell];
+
+    // Patch: Fix crash in macOS 10.14.
+    // Somehow item and imageCell are retained and attempt to be drawn if left in view.
+    [item setView: nil];
+
     [imageCell release];
     [item release];
     [super dealloc];
@@ -482,6 +518,10 @@ QT_END_NAMESPACE
          selector:@selector(menuTrackingDone:)
              name:NSMenuDidEndTrackingNotification
                  object:m];
+
+        // Patch: Create a rich os x tray icon (pixel-perfect, theme switching).
+        menuVisible = true;
+
         [item popUpStatusItemMenu: m];
     }
 }
diff --git a/src/plugins/platforms/cocoa/qcocoawindow.mm b/src/plugins/platforms/cocoa/qcocoawindow.mm
index c0d5904367..f3c2047196 100644
--- a/src/plugins/platforms/cocoa/qcocoawindow.mm
+++ b/src/plugins/platforms/cocoa/qcocoawindow.mm
@@ -141,7 +141,8 @@ static bool isMouseEvent(NSEvent *ev)
     if (!self.window.delegate)
         return; // Already detached, pending NSAppKitDefined event
 
-    if (pw && pw->frameStrutEventsEnabled() && isMouseEvent(theEvent)) {
+    // Patch: Fix restore after minimize or close by window buttons.
+    if (pw && pw->frameStrutEventsEnabled() && pw->m_synchedWindowState != Qt::WindowMinimized && pw->m_isExposed && isMouseEvent(theEvent)) {
         NSPoint loc = [theEvent locationInWindow];
         NSRect windowFrame = [self.window convertRectFromScreen:[self.window frame]];
         NSRect contentFrame = [[self.window contentView] frame];
@@ -811,6 +812,16 @@ NSUInteger QCocoaWindow::windowStyleMask(Qt::WindowFlags flags)
 {
     Qt::WindowType type = static_cast<Qt::WindowType>(int(flags & Qt::WindowType_Mask));
     NSInteger styleMask = NSBorderlessWindowMask;
+
+    // Patch: allow creating panels floating on all spaces in macOS.
+    // If you call "setCollectionBehavior:NSWindowCollectionBehaviorFullScreenAuxiliary" before
+    // setting the "NSNonactivatingPanelMask" bit in the style mask it won't work after that.
+    // So we need a way to set that bit before Qt sets collection behavior the way it does.
+    QVariant nonactivatingPanelMask = window()->property("_td_macNonactivatingPanelMask");
+    if (nonactivatingPanelMask.isValid() && nonactivatingPanelMask.toBool()) {
+        styleMask |= NSNonactivatingPanelMask;
+    }
+
     if (flags & Qt::FramelessWindowHint)
         return styleMask;
     if ((type & Qt::Popup) == Qt::Popup) {
@@ -943,6 +954,19 @@ void QCocoaWindow::setWindowFilePath(const QString &filePath)
     [m_nsWindow setRepresentedFilename: fi.exists() ? QCFString::toNSString(filePath) : @""];
 }
 
+// Patch: Create a good os x window icon (pixel-perfect).
+namespace {
+
+qreal getDevicePixelRatio() {
+    qreal result = 1.0;
+    foreach (QScreen *screen, QGuiApplication::screens()) {
+        result = qMax(result, screen->devicePixelRatio());
+    }
+    return result;
+}
+
+} // namespace
+
 void QCocoaWindow::setWindowIcon(const QIcon &icon)
 {
     QMacAutoReleasePool pool;
@@ -958,7 +982,9 @@ void QCocoaWindow::setWindowIcon(const QIcon &icon)
     if (icon.isNull()) {
         [iconButton setImage:nil];
     } else {
-        QPixmap pixmap = icon.pixmap(QSize(22, 22));
+        // Patch: Create a good os x window icon (pixel-perfect).
+        CGFloat hgt = 16. * getDevicePixelRatio();
+        QPixmap pixmap = icon.pixmap(QSize(hgt, hgt));
         NSImage *image = static_cast<NSImage *>(qt_mac_create_nsimage(pixmap));
         [iconButton setImage:image];
         [image release];
diff --git a/src/plugins/platforms/cocoa/qnsview.mm b/src/plugins/platforms/cocoa/qnsview.mm
index c67bcfd23b..6a60670aee 100644
--- a/src/plugins/platforms/cocoa/qnsview.mm
+++ b/src/plugins/platforms/cocoa/qnsview.mm
@@ -647,6 +647,12 @@ QT_WARNING_POP
     [self invalidateWindowShadowIfNeeded];
 }
 
+- (void)viewDidChangeBackingProperties
+{
+    if (self.layer)
+        self.layer.contentsScale = self.window.backingScaleFactor;
+}
+
 - (BOOL) isFlipped
 {
     return YES;
@@ -1431,7 +1437,9 @@ static QTabletEvent::TabletDevice wacomTabletDevice(NSEvent *theEvent)
 #if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_8
     if (QSysInfo::QSysInfo::MacintoshVersion >= QSysInfo::MV_10_8) {
         // On 10.8 and above, MayBegin is likely to happen.  We treat it the same as an actual begin.
-        if (phase == NSEventPhaseMayBegin) {
+
+        // Patch: Fix actual begin handle of swipe on trackpad.
+        if (phase == NSEventPhaseMayBegin || phase == NSEventPhaseBegan) {
             m_scrolling = true;
             ph = Qt::ScrollBegin;
         }
@@ -1496,14 +1504,14 @@ static QTabletEvent::TabletDevice wacomTabletDevice(NSEvent *theEvent)
     quint32 nativeVirtualKey = [nsevent keyCode];
 
     QChar ch = QChar::ReplacementCharacter;
-    int keyCode = Qt::Key_unknown;
-    if ([characters length] != 0) {
-        if (((modifiers & Qt::MetaModifier) || (modifiers & Qt::AltModifier)) && ([charactersIgnoringModifiers length] != 0))
-            ch = QChar([charactersIgnoringModifiers characterAtIndex:0]);
-        else
-            ch = QChar([characters characterAtIndex:0]);
-        keyCode = [self convertKeyCode:ch];
-    }
+
+    // Patch: Fix Alt+.. shortcuts in OS X. See https://bugreports.qt.io/browse/QTBUG-42584 at the end.
+    if ([characters length] != 0)
+        ch = QChar([characters characterAtIndex:0]);
+    else if ([charactersIgnoringModifiers length] != 0 && ((modifiers & Qt::MetaModifier) || (modifiers & Qt::AltModifier)))
+        ch = QChar([charactersIgnoringModifiers characterAtIndex:0]);
+
+    int keyCode = [self convertKeyCode:ch];
 
     // we will send a key event unless the input method sets m_sendKeyEvent to false
     m_sendKeyEvent = true;
@@ -1569,6 +1577,23 @@ static QTabletEvent::TabletDevice wacomTabletDevice(NSEvent *theEvent)
     [self handleKeyEvent:nsevent eventType:int(QEvent::KeyRelease)];
 }
 
+// Patch: Enable Ctrl+Tab and Ctrl+Shift+Tab / Ctrl+Backtab handle in-app.
+- (BOOL)performKeyEquivalent:(NSEvent *)nsevent
+{
+    NSString *chars = [nsevent charactersIgnoringModifiers];
+
+    if ([nsevent type] == NSKeyDown && [chars length] > 0) {
+        QChar ch = [chars characterAtIndex:0];
+        Qt::Key qtKey = qt_mac_cocoaKey2QtKey(ch);
+        if ([nsevent modifierFlags] & NSControlKeyMask
+                && (qtKey == Qt::Key_Tab || qtKey == Qt::Key_Backtab)) {
+            [self handleKeyEvent:nsevent eventType:int(QEvent::KeyPress)];
+            return YES;
+        }
+    }
+    return [super performKeyEquivalent:nsevent];
+}
+
 - (void)cancelOperation:(id)sender
 {
     Q_UNUSED(sender);
@@ -1981,6 +2006,10 @@ static QPoint mapWindowCoordinates(QWindow *source, QWindow *target, QPoint poin
     // change the cursor
     [nativeCursor set];
 
+    // Patch: Backport a fix from cd08753d3e. Starting with macOS Mojave this requires accessibility access.
+    if (QSysInfo::macVersion() >= Q_MV_OSX(10, 14))
+        return;
+
     // Make sure the cursor is updated correctly if the mouse does not move and window is under cursor
     // by creating a fake move event
     if (m_updatingDrag)
diff --git a/src/plugins/platforms/windows/qwindowsdialoghelpers.cpp b/src/plugins/platforms/windows/qwindowsdialoghelpers.cpp
index 94bb71e429..16ab51e166 100644
--- a/src/plugins/platforms/windows/qwindowsdialoghelpers.cpp
+++ b/src/plugins/platforms/windows/qwindowsdialoghelpers.cpp
@@ -716,12 +716,20 @@ public:
     void setSelectedFiles(const QList<QUrl> &);
     QString selectedFile() const;
 
+    // Patch: Adding select-by-url for Windows file dialog.
+    void setSelectedRemoteContent(const QByteArray &);
+    QByteArray selectedRemoteContent() const;
+
 private:
     class Data : public QSharedData {
     public:
         QUrl directory;
         QString selectedNameFilter;
         QList<QUrl> selectedFiles;
+
+        // Patch: Adding select-by-url for Windows file dialog.
+        QByteArray selectedRemoteContent;
+
         QMutex mutex;
     };
     QExplicitlySharedDataPointer<Data> m_data;
@@ -775,6 +783,21 @@ inline void QWindowsFileDialogSharedData::setSelectedFiles(const QList<QUrl> &ur
     m_data->selectedFiles = urls;
 }
 
+// Patch: Adding select-by-url for Windows file dialog.
+inline QByteArray QWindowsFileDialogSharedData::selectedRemoteContent() const
+{
+    m_data->mutex.lock();
+    const QByteArray result = m_data->selectedRemoteContent;
+    m_data->mutex.unlock();
+    return result;
+}
+
+inline void QWindowsFileDialogSharedData::setSelectedRemoteContent(const QByteArray &c)
+{
+    QMutexLocker(&m_data->mutex);
+    m_data->selectedRemoteContent = c;
+}
+
 inline void QWindowsFileDialogSharedData::fromOptions(const QSharedPointer<QFileDialogOptions> &o)
 {
     QMutexLocker locker(&m_data->mutex);
@@ -899,6 +922,9 @@ public:
     // example by appended default suffixes, etc.
     virtual QList<QUrl> dialogResult() const = 0;
 
+    // Patch: Adding select-by-url for Windows file dialog.
+    virtual QByteArray dialogRemoteContent() const { return QByteArray(); }
+
     inline void onFolderChange(IShellItem *);
     inline void onSelectionChange();
     inline void onTypeChange();
@@ -1338,7 +1364,14 @@ void QWindowsNativeFileDialogBase::selectFile(const QString &fileName) const
     // Hack to prevent CLSIDs from being set as file name due to
     // QFileDialogPrivate::initialSelection() being QString-based.
     if (!isClsid(fileName))
-        m_fileDialog->SetFileName((wchar_t*)fileName.utf16());
+    // Patch: Fix handle of full fileName.
+    {
+        QString file = QDir::toNativeSeparators(fileName);
+        int lastBackSlash = file.lastIndexOf(QChar::fromLatin1('\\'));
+        if (lastBackSlash >= 0)
+            file = file.mid(lastBackSlash + 1);
+        m_fileDialog->SetFileName((wchar_t*)file.utf16());;
+    }
 }
 
 // Return the index of the selected filter, accounting for QFileDialog
@@ -1408,6 +1441,10 @@ bool QWindowsNativeFileDialogBase::onFileOk()
 {
     // Store selected files as GetResults() returns invalid data after the dialog closes.
     m_data.setSelectedFiles(dialogResult());
+
+    // Patch: Adding select-by-url for Windows file dialog.
+    m_data.setSelectedRemoteContent(dialogRemoteContent());
+
     return true;
 }
 
@@ -1542,6 +1579,9 @@ public:
     QList<QUrl> selectedFiles() const Q_DECL_OVERRIDE;
     QList<QUrl> dialogResult() const Q_DECL_OVERRIDE;
 
+    // Patch: Adding select-by-url for Windows file dialog.
+    QByteArray dialogRemoteContent() const Q_DECL_OVERRIDE;
+
 private:
     inline IFileOpenDialog *openFileDialog() const
         { return static_cast<IFileOpenDialog *>(fileDialog()); }
@@ -1556,6 +1596,62 @@ QList<QUrl> QWindowsNativeOpenFileDialog::dialogResult() const
     return result;
 }
 
+// Patch: Adding select-by-url for Windows file dialog.
+QByteArray QWindowsNativeOpenFileDialog::dialogRemoteContent() const
+{
+    QByteArray result;
+    IShellItemArray *items = 0;
+    if (FAILED(openFileDialog()->GetResults(&items)) || !items)
+        return result;
+    DWORD itemCount = 0;
+    if (FAILED(items->GetCount(&itemCount)) || !itemCount)
+        return result;
+    for (DWORD i = 0; i < itemCount; ++i)
+    {
+        IShellItem *item = 0;
+        if (SUCCEEDED(items->GetItemAt(i, &item))) {
+            SFGAOF attributes = 0;
+            // Check whether it has a file system representation?
+            if (FAILED(item->GetAttributes(SFGAO_FILESYSTEM, &attributes)) || (attributes & SFGAO_FILESYSTEM))
+            {
+                LPWSTR name = 0;
+                if (SUCCEEDED(item->GetDisplayName(SIGDN_FILESYSPATH, &name)))
+                {
+                    CoTaskMemFree(name);
+                    continue;
+                }
+            }
+            if (FAILED(item->GetAttributes(SFGAO_STREAM, &attributes)) || !(attributes & SFGAO_STREAM))
+                continue;
+
+            IBindCtx *bind = 0;
+            if (FAILED(CreateBindCtx(0, &bind)))
+                continue;
+
+            IStream *stream = 0;
+            if (FAILED(item->BindToHandler(bind, BHID_Stream, IID_IStream, reinterpret_cast<void **>(&stream))))
+                continue;
+
+            STATSTG stat = { 0 };
+            if (FAILED(stream->Stat(&stat, STATFLAG_NONAME)) || !stat.cbSize.QuadPart)
+                continue;
+
+            quint64 fullSize = stat.cbSize.QuadPart;
+            if (fullSize <= 64 * 1024 * 1024)
+            {
+                result.resize(fullSize);
+                ULONG read = 0;
+                HRESULT r = stream->Read(result.data(), fullSize, &read);
+                if (r == S_FALSE || r == S_OK)
+                    return result;
+
+                result.clear();
+            }
+        }
+    }
+    return result;
+}
+
 QList<QUrl> QWindowsNativeOpenFileDialog::selectedFiles() const
 {
     QList<QUrl> result;
@@ -1614,6 +1710,10 @@ public:
     virtual QUrl directory() const Q_DECL_OVERRIDE;
     virtual void selectFile(const QUrl &filename) Q_DECL_OVERRIDE;
     virtual QList<QUrl> selectedFiles() const Q_DECL_OVERRIDE;
+
+    // Patch: Adding select-by-url for Windows file dialog.
+    virtual QByteArray selectedRemoteContent() const Q_DECL_OVERRIDE;
+
     virtual void setFilter() Q_DECL_OVERRIDE;
     virtual void selectNameFilter(const QString &filter) Q_DECL_OVERRIDE;
     virtual QString selectedNameFilter() const Q_DECL_OVERRIDE;
@@ -1707,6 +1807,12 @@ QList<QUrl> QWindowsFileDialogHelper::selectedFiles() const
     return m_data.selectedFiles();
 }
 
+// Patch: Adding select-by-url for Windows file dialog.
+QByteArray QWindowsFileDialogHelper::selectedRemoteContent() const
+{
+    return m_data.selectedRemoteContent();
+}
+
 void QWindowsFileDialogHelper::setFilter()
 {
     qCDebug(lcQpaDialogs) << __FUNCTION__;
@@ -1996,6 +2102,10 @@ public:
     QUrl directory() const Q_DECL_OVERRIDE;
     void selectFile(const QUrl &url) Q_DECL_OVERRIDE;
     QList<QUrl> selectedFiles() const Q_DECL_OVERRIDE;
+
+    // Patch: Adding select-by-url for Windows file dialog.
+    QByteArray selectedRemoteContent() const Q_DECL_OVERRIDE;
+
     void setFilter() Q_DECL_OVERRIDE {}
     void selectNameFilter(const QString &) Q_DECL_OVERRIDE;
     QString selectedNameFilter() const Q_DECL_OVERRIDE;
@@ -2039,6 +2149,12 @@ QList<QUrl> QWindowsXpFileDialogHelper::selectedFiles() const
     return m_data.selectedFiles();
 }
 
+// Patch: Adding select-by-url for Windows file dialog.
+QByteArray QWindowsXpFileDialogHelper::selectedRemoteContent() const
+{
+    return m_data.selectedRemoteContent();
+}
+
 void QWindowsXpFileDialogHelper::selectNameFilter(const QString &f)
 {
     m_data.setSelectedNameFilter(f); // Dialog cannot be updated at run-time.
diff --git a/src/plugins/platforms/windows/qwindowskeymapper.cpp b/src/plugins/platforms/windows/qwindowskeymapper.cpp
index 1e58b9b3d4..1741c21a1c 100644
--- a/src/plugins/platforms/windows/qwindowskeymapper.cpp
+++ b/src/plugins/platforms/windows/qwindowskeymapper.cpp
@@ -1268,6 +1268,10 @@ QList<int> QWindowsKeyMapper::possibleKeys(const QKeyEvent *e) const
     if (nativeVirtualKey > 255)
         return result;
 
+    // Patch: This must not happen, but there are crash reports on the next line.
+    if (e->nativeVirtualKey() > 0xFF)
+        return result;
+
     const KeyboardLayoutItem &kbItem = keyLayout[nativeVirtualKey];
     if (!kbItem.exists)
         return result;
diff --git a/src/plugins/platforms/windows/qwindowsservices.cpp b/src/plugins/platforms/windows/qwindowsservices.cpp
index 1d23a9d9b9..640cd426ed 100644
--- a/src/plugins/platforms/windows/qwindowsservices.cpp
+++ b/src/plugins/platforms/windows/qwindowsservices.cpp
@@ -127,6 +127,10 @@ static inline bool launchMail(const QUrl &url)
             command.prepend(doubleQuote);
         }
     }
+
+    // Patch: Fix mail launch if no param is expected in this command.
+    if (command.indexOf(QStringLiteral("%1")) < 0) return false;
+
     // Pass the url as the parameter. Should use QProcess::startDetached(),
     // but that cannot handle a Windows command line [yet].
     command.replace(QStringLiteral("%1"), url.toString(QUrl::FullyEncoded));
diff --git a/src/plugins/platforms/windows/qwindowswindow.cpp b/src/plugins/platforms/windows/qwindowswindow.cpp
index b38d7c29ae..34f19c4efa 100644
--- a/src/plugins/platforms/windows/qwindowswindow.cpp
+++ b/src/plugins/platforms/windows/qwindowswindow.cpp
@@ -1020,7 +1020,8 @@ void QWindowsWindow::destroyWindow()
         // Clear any transient child relationships as Windows will otherwise destroy them (QTBUG-35499, QTBUG-36666)
         if (QWindow *transientChild = findTransientChild(window()))
             if (QWindowsWindow *tw = QWindowsWindow::baseWindowOf(transientChild))
-                tw->updateTransientParent();
+                // Patch: Fix possibility of add / remove taskbar icon of the window.
+                tw->clearTransientParent();
         QWindowsContext *context = QWindowsContext::instance();
         if (context->windowUnderMouse() == window())
             context->clearWindowUnderMouse();
@@ -1235,6 +1236,21 @@ void QWindowsWindow::updateTransientParent() const
         if (const QWindowsWindow *tw = QWindowsWindow::baseWindowOf(tp))
             if (!tw->testFlag(WithinDestroy)) // Prevent destruction by parent window (QTBUG-35499, QTBUG-36666)
                 newTransientParent = tw->handle();
+    // Patch: Fix possibility of add / remove taskbar icon of the window.
+    if (newTransientParent && newTransientParent != oldTransientParent)
+        SetWindowLongPtr(m_data.hwnd, GWL_HWNDPARENT, (LONG_PTR)newTransientParent);
+#endif // !Q_OS_WINCE
+}
+
+// Patch: Fix possibility of add / remove taskbar icon of the window.
+void QWindowsWindow::clearTransientParent() const
+{
+#ifndef Q_OS_WINCE
+    if (window()->type() == Qt::Popup)
+        return; // QTBUG-34503, // a popup stays on top, no parent, see also WindowCreationData::fromWindow().
+    // Update transient parent.
+    const HWND oldTransientParent = transientParentHwnd(m_data.hwnd);
+    HWND newTransientParent = 0;
     if (newTransientParent != oldTransientParent)
         SetWindowLongPtr(m_data.hwnd, GWL_HWNDPARENT, (LONG_PTR)newTransientParent);
 #endif // !Q_OS_WINCE
@@ -1448,10 +1464,14 @@ void QWindowsWindow::handleResized(int wParam)
         handleGeometryChange();
         break;
     case SIZE_RESTORED:
-        if (isFullScreen_sys())
-            handleWindowStateChange(Qt::WindowFullScreen);
-        else if (m_windowState != Qt::WindowNoState && !testFlag(MaximizeToFullScreen))
+        // Patch: When resolution is changed for a frameless fullscreen widget
+        // handleWindowStateChange call prevents correct geometry get in handleGeometryChange().
+        if (isFullScreen_sys()) {
+            if (m_windowState != Qt::WindowFullScreen)
+                handleWindowStateChange(Qt::WindowFullScreen);
+        } else if (m_windowState != Qt::WindowNoState && !testFlag(MaximizeToFullScreen)) {
             handleWindowStateChange(Qt::WindowNoState);
+        }
         handleGeometryChange();
         break;
     }
diff --git a/src/plugins/platforms/windows/qwindowswindow.h b/src/plugins/platforms/windows/qwindowswindow.h
index 6fffa1e6e9..cb1c9c1161 100644
--- a/src/plugins/platforms/windows/qwindowswindow.h
+++ b/src/plugins/platforms/windows/qwindowswindow.h
@@ -265,6 +265,10 @@ private:
     inline void setWindowState_sys(Qt::WindowState newState);
     inline void setParent_sys(const QPlatformWindow *parent);
     inline void updateTransientParent() const;
+
+    // Patch: Fix possibility of add / remove taskbar icon of the window.
+    inline void clearTransientParent() const;
+
     void destroyWindow();
     inline bool isDropSiteEnabled() const { return m_dropTarget != 0; }
     void setDropSiteEnabled(bool enabled);
diff --git a/src/plugins/platforms/xcb/qxcbnativeinterface.cpp b/src/plugins/platforms/xcb/qxcbnativeinterface.cpp
index 09e7ecf3a3..c0f15a4242 100644
--- a/src/plugins/platforms/xcb/qxcbnativeinterface.cpp
+++ b/src/plugins/platforms/xcb/qxcbnativeinterface.cpp
@@ -79,7 +79,10 @@ static int resourceType(const QByteArray &key)
         QByteArrayLiteral("rootwindow"),
         QByteArrayLiteral("subpixeltype"), QByteArrayLiteral("antialiasingenabled"),
         QByteArrayLiteral("nofonthinting"),
-        QByteArrayLiteral("atspibus")
+        QByteArrayLiteral("atspibus"),
+
+        // Patch: Backport compositing manager check from Qt 5.7
+        QByteArrayLiteral("compositingenabled")
     };
     const QByteArray *end = names + sizeof(names) / sizeof(names[0]);
     const QByteArray *result = std::find(names, end, key);
@@ -252,6 +255,13 @@ void *QXcbNativeInterface::nativeResourceForScreen(const QByteArray &resourceStr
     case RootWindow:
         result = reinterpret_cast<void *>(xcbScreen->root());
         break;
+
+    // Patch: Backport compositing manager check from Qt 5.7
+    case CompositingEnabled:
+        if (QXcbVirtualDesktop *vd = xcbScreen->virtualDesktop())
+            result = vd->compositingActive() ? this : Q_NULLPTR;
+        break;
+
     default:
         break;
     }
diff --git a/src/plugins/platforms/xcb/qxcbnativeinterface.h b/src/plugins/platforms/xcb/qxcbnativeinterface.h
index f88b710864..6f818a5a72 100644
--- a/src/plugins/platforms/xcb/qxcbnativeinterface.h
+++ b/src/plugins/platforms/xcb/qxcbnativeinterface.h
@@ -68,7 +68,10 @@ public:
         ScreenSubpixelType,
         ScreenAntialiasingEnabled,
         NoFontHinting,
-        AtspiBus
+        AtspiBus,
+
+        // Patch: Backport compositing manager check from Qt 5.7
+        CompositingEnabled
     };
 
     QXcbNativeInterface();
diff --git a/src/widgets/dialogs/qfiledialog.cpp b/src/widgets/dialogs/qfiledialog.cpp
index bc2de899f5..aa8f8df4ad 100644
--- a/src/widgets/dialogs/qfiledialog.cpp
+++ b/src/widgets/dialogs/qfiledialog.cpp
@@ -1200,6 +1200,15 @@ QList<QUrl> QFileDialogPrivate::userSelectedFiles() const
     return files;
 }
 
+// Patch: Adding select-by-url for Windows file dialog.
+QByteArray QFileDialogPrivate::userSelectedRemoteContent() const
+{
+    if (nativeDialogInUse)
+        return selectedRemoteContent_sys();
+
+    return QByteArray();
+}
+
 QStringList QFileDialogPrivate::addDefaultSuffixToFiles(const QStringList &filesToFix) const
 {
     QStringList files;
@@ -1267,6 +1276,14 @@ QStringList QFileDialog::selectedFiles() const
     return files;
 }
 
+// Patch: Adding select-by-url for Windows file dialog.
+QByteArray QFileDialog::selectedRemoteContent() const
+{
+    Q_D(const QFileDialog);
+
+    return d->userSelectedRemoteContent();
+}
+
 /*!
     Returns a list of urls containing the selected files in the dialog.
     If no files are selected, or the mode is not ExistingFiles or
diff --git a/src/widgets/dialogs/qfiledialog.h b/src/widgets/dialogs/qfiledialog.h
index ffe49a2dd2..42dc563c8a 100644
--- a/src/widgets/dialogs/qfiledialog.h
+++ b/src/widgets/dialogs/qfiledialog.h
@@ -108,6 +108,9 @@ public:
     void selectFile(const QString &filename);
     QStringList selectedFiles() const;
 
+    // Patch: Adding select-by-url for Windows file dialog.
+    QByteArray selectedRemoteContent() const;
+
     void selectUrl(const QUrl &url);
     QList<QUrl> selectedUrls() const;
 
diff --git a/src/widgets/dialogs/qfiledialog_p.h b/src/widgets/dialogs/qfiledialog_p.h
index f610e46f83..547a64695a 100644
--- a/src/widgets/dialogs/qfiledialog_p.h
+++ b/src/widgets/dialogs/qfiledialog_p.h
@@ -123,6 +123,10 @@ public:
     static QString initialSelection(const QUrl &path);
     QStringList typedFiles() const;
     QList<QUrl> userSelectedFiles() const;
+
+    // Patch: Adding select-by-url for Windows file dialog.
+    QByteArray userSelectedRemoteContent() const;
+
     QStringList addDefaultSuffixToFiles(const QStringList &filesToFix) const;
     QList<QUrl> addDefaultSuffixToUrls(const QList<QUrl> &urlsToFix) const;
     bool removeDirectory(const QString &path);
@@ -256,6 +260,10 @@ public:
     QUrl directory_sys() const;
     void selectFile_sys(const QUrl &filename);
     QList<QUrl> selectedFiles_sys() const;
+
+    // Patch: Adding select-by-url for Windows file dialog.
+    QByteArray selectedRemoteContent_sys() const;
+
     void setFilter_sys();
     void selectNameFilter_sys(const QString &filter);
     QString selectedNameFilter_sys() const;
@@ -393,6 +401,14 @@ inline QList<QUrl> QFileDialogPrivate::selectedFiles_sys() const
     return QList<QUrl>();
 }
 
+// Patch: Adding select-by-url for Windows file dialog.
+inline QByteArray QFileDialogPrivate::selectedRemoteContent_sys() const
+{
+    if (QPlatformFileDialogHelper *helper = platformFileDialogHelper())
+        return helper->selectedRemoteContent();
+    return QByteArray();
+}
+
 inline void QFileDialogPrivate::setFilter_sys()
 {
     if (QPlatformFileDialogHelper *helper = platformFileDialogHelper())
diff --git a/src/widgets/kernel/qwidget.cpp b/src/widgets/kernel/qwidget.cpp
index b1d80d7b8f..42e32fd404 100644
--- a/src/widgets/kernel/qwidget.cpp
+++ b/src/widgets/kernel/qwidget.cpp
@@ -5138,6 +5138,17 @@ void QWidget::render(QPainter *painter, const QPoint &targetOffset,
         return; // Fully transparent.
 
     Q_D(QWidget);
+
+    // Patch: save and restore dirtyOpaqueChildren field.
+    //
+    // Just like in QWidget::grab() this field should be restored
+    // after the d->render() call, because it will be set to 1 and
+    // opaqueChildren field will be filled with empty region in
+    // case the widget is hidden (because all the opaque children
+    // will be skipped in isVisible() check).
+    //
+    const bool oldDirtyOpaqueChildren = d->dirtyOpaqueChildren;
+
     const bool inRenderWithPainter = d->extra && d->extra->inRenderWithPainter;
     const QRegion toBePainted = !inRenderWithPainter ? d->prepareToRender(sourceRegion, renderFlags)
                                                      : sourceRegion;
@@ -5159,6 +5170,10 @@ void QWidget::render(QPainter *painter, const QPoint &targetOffset,
     if (!inRenderWithPainter && (opacity < 1.0 || (target->devType() == QInternal::Printer))) {
         d->render_helper(painter, targetOffset, toBePainted, renderFlags);
         d->extra->inRenderWithPainter = inRenderWithPainter;
+
+        // Patch: save and restore dirtyOpaqueChildren field.
+        d->dirtyOpaqueChildren = oldDirtyOpaqueChildren;
+
         return;
     }
 
@@ -5190,6 +5205,9 @@ void QWidget::render(QPainter *painter, const QPoint &targetOffset,
     d->setSharedPainter(oldPainter);
 
     d->extra->inRenderWithPainter = inRenderWithPainter;
+
+    // Patch: save and restore dirtyOpaqueChildren field.
+    d->dirtyOpaqueChildren = oldDirtyOpaqueChildren;
 }
 
 static void sendResizeEvents(QWidget *target)
@@ -8769,7 +8787,8 @@ bool QWidget::event(QEvent *event)
     case QEvent::KeyPress: {
         QKeyEvent *k = (QKeyEvent *)event;
         bool res = false;
-        if (!(k->modifiers() & (Qt::ControlModifier | Qt::AltModifier))) {  //### Add MetaModifier?
+        // Patch: Enable Ctrl+Tab and Ctrl+Shift+Tab / Ctrl+Backtab handle in-app.
+        if (!(k->modifiers() & (Qt::ControlModifier | Qt::AltModifier | Qt::MetaModifier))) {  //### Add MetaModifier?
             if (k->key() == Qt::Key_Backtab
                 || (k->key() == Qt::Key_Tab && (k->modifiers() & Qt::ShiftModifier)))
                 res = focusNextPrevChild(false);
diff --git a/src/widgets/util/qsystemtrayicon.cpp b/src/widgets/util/qsystemtrayicon.cpp
index 704142fe5c..7c4340e459 100644
--- a/src/widgets/util/qsystemtrayicon.cpp
+++ b/src/widgets/util/qsystemtrayicon.cpp
@@ -709,6 +709,10 @@ void QSystemTrayIconPrivate::updateMenu_sys_qpa()
     if (menu) {
         addPlatformMenu(menu);
         qpa_sys->updateMenu(menu->platformMenu());
+
+    // Patch: Create a rich os x tray icon (pixel-perfect, theme switching).
+    } else {
+        qpa_sys->updateMenu(nullptr);
     }
 }
 
diff --git a/src/widgets/widgets/qabstractscrollarea.cpp b/src/widgets/widgets/qabstractscrollarea.cpp
index 2e2a042bf1..472e37722b 100644
--- a/src/widgets/widgets/qabstractscrollarea.cpp
+++ b/src/widgets/widgets/qabstractscrollarea.cpp
@@ -640,15 +640,22 @@ scrolling range.
 QSize QAbstractScrollArea::maximumViewportSize() const
 {
     Q_D(const QAbstractScrollArea);
-    int hsbExt = d->hbar->sizeHint().height();
-    int vsbExt = d->vbar->sizeHint().width();
+    // Patch: Count the sizeHint of the bar only if it is displayed.
+    //int hsbExt = d->hbar->sizeHint().height();
+    //int vsbExt = d->vbar->sizeHint().width();
 
     int f = 2 * d->frameWidth;
     QSize max = size() - QSize(f + d->left + d->right, f + d->top + d->bottom);
-    if (d->vbarpolicy == Qt::ScrollBarAlwaysOn)
+
+    // Patch: Count the sizeHint of the bar only if it is displayed.
+    if (d->vbarpolicy == Qt::ScrollBarAlwaysOn) {
+        int vsbExt = d->vbar->sizeHint().width();
         max.rwidth() -= vsbExt;
-    if (d->hbarpolicy == Qt::ScrollBarAlwaysOn)
+    }
+    if (d->hbarpolicy == Qt::ScrollBarAlwaysOn) {
+        int hsbExt = d->hbar->sizeHint().height();
         max.rheight() -= hsbExt;
+    }
     return max;
 }
 
diff --git a/src/widgets/widgets/qwidgetlinecontrol.cpp b/src/widgets/widgets/qwidgetlinecontrol.cpp
index daf9f00c46..57499dc4a4 100644
--- a/src/widgets/widgets/qwidgetlinecontrol.cpp
+++ b/src/widgets/widgets/qwidgetlinecontrol.cpp
@@ -40,6 +40,11 @@
 #include <private/qguiapplication_p.h>
 #include <qpa/qplatformtheme.h>
 #include <qstylehints.h>
+
+// Patch: Enable Ctrl+key and Ctrl+Shift+key in all locales except German.
+// See https://github.com/telegramdesktop/tdesktop/pull/1185.
+#include <QtCore/QLocale>
+
 #ifndef QT_NO_ACCESSIBILITY
 #include "qaccessible.h"
 #endif
@@ -1882,11 +1887,21 @@ void QWidgetLineControl::processKeyEvent(QKeyEvent* event)
     }
 
     // QTBUG-35734: ignore Ctrl/Ctrl+Shift; accept only AltGr (Alt+Ctrl) on German keyboards
-    if (unknown && !isReadOnly()
-        && event->modifiers() != Qt::ControlModifier
-        && event->modifiers() != (Qt::ControlModifier | Qt::ShiftModifier)) {
+
+    // Patch: Enable Ctrl+key and Ctrl+Shift+key in all locales except German.
+    // See https://github.com/telegramdesktop/tdesktop/pull/1185.
+    bool skipCtrlAndCtrlShift = false;
+    if (QGuiApplication::inputMethod()->locale().language() == QLocale::German) {
+        if (event->modifiers() == Qt::ControlModifier
+            || event->modifiers() == (Qt::ControlModifier | Qt::ShiftModifier)) {
+            skipCtrlAndCtrlShift = true;
+        }
+    }
+    if (unknown && !isReadOnly() && !skipCtrlAndCtrlShift) {
         QString t = event->text();
-        if (!t.isEmpty() && t.at(0).isPrint()) {
+
+        // Patch: Enable ZWJ and ZWNJ characters to be in text input.
+        if (!t.isEmpty() && (t.at(0).isPrint() || t.at(0).unicode() == 0x200C || t.at(0).unicode() == 0x200D)) {
             insert(t);
 #ifndef QT_NO_COMPLETER
             complete(event->key());
diff --git a/src/widgets/widgets/qwidgettextcontrol.cpp b/src/widgets/widgets/qwidgettextcontrol.cpp
index deca002bf5..8a2023f503 100644
--- a/src/widgets/widgets/qwidgettextcontrol.cpp
+++ b/src/widgets/widgets/qwidgettextcontrol.cpp
@@ -71,6 +71,11 @@
 #include <qinputmethod.h>
 #include <qtooltip.h>
 #include <qstyleoption.h>
+
+// Patch: Enable Ctrl+key and Ctrl+Shift+key in all locales except German.
+// See https://github.com/telegramdesktop/tdesktop/pull/1185.
+#include <QtCore/QLocale>
+
 #include <QtWidgets/qlineedit.h>
 #include <QtGui/qaccessible.h>
 #include <QtCore/qmetaobject.h>
@@ -1343,13 +1348,24 @@ void QWidgetTextControlPrivate::keyPressEvent(QKeyEvent *e)
 process:
     {
         // QTBUG-35734: ignore Ctrl/Ctrl+Shift; accept only AltGr (Alt+Ctrl) on German keyboards
-        if (e->modifiers() == Qt::ControlModifier
-            || e->modifiers() == (Qt::ShiftModifier | Qt::ControlModifier)) {
+
+        // Patch: Enable Ctrl+key and Ctrl+Shift+key in all locales except German.
+        // See https://github.com/telegramdesktop/tdesktop/pull/1185.
+        bool skipCtrlAndCtrlShift = false;
+        if (QGuiApplication::inputMethod()->locale().language() == QLocale::German) {
+            if (e->modifiers() == Qt::ControlModifier
+                || e->modifiers() == (Qt::ControlModifier | Qt::ShiftModifier)) {
+                skipCtrlAndCtrlShift = true;
+            }
+        }
+        if (skipCtrlAndCtrlShift) {
             e->ignore();
             return;
         }
         QString text = e->text();
-        if (!text.isEmpty() && (text.at(0).isPrint() || text.at(0) == QLatin1Char('\t'))) {
+
+        // Patch: Enable ZWJ and ZWNJ characters to be in text input.
+        if (!text.isEmpty() && (text.at(0).isPrint() || text.at(0) == QLatin1Char('\t') || text.at(0).unicode() == 0x200C || text.at(0).unicode() == 0x200D)) {
             if (overwriteMode
                 // no need to call deleteChar() if we have a selection, insertText
                 // does it already
