Merge "Merge remote-tracking branch 'origin/stable' into dev" into refs/staging/dev

23 files changed, 249 insertions, 283 deletions

diff --git a/src/plugins/bearer/connman/qconnmanengine.cpp b/src/plugins/bearer/connman/qconnmanengine.cpp
index 2b28cdbf61..589b0e2c24 100644
--- a/src/plugins/bearer/connman/qconnmanengine.cpp
+++ b/src/plugins/bearer/connman/qconnmanengine.cpp
@@ -159,7 +159,7 @@ void QConnmanEngine::connectToId(const QString &id)
             QOfonoDataConnectionManagerInterface dc(modemPath,0);
             foreach (const QDBusObjectPath &dcPath,dc.getPrimaryContexts()) {
                 if(dcPath.path().contains(servicePath.section("_",-1))) {
-                    QOfonoPrimaryDataContextInterface primaryContext(dcPath.path(),0);
+                    QOfonoConnectionContextInterface primaryContext(dcPath.path(),0);
                     primaryContext.setActive(true);
                 }
             }
@@ -183,7 +183,7 @@ void QConnmanEngine::disconnectFromId(const QString &id)
             QOfonoDataConnectionManagerInterface dc(modemPath,0);
             foreach (const QDBusObjectPath &dcPath,dc.getPrimaryContexts()) {
                 if(dcPath.path().contains(servicePath.section("_",-1))) {
-                    QOfonoPrimaryDataContextInterface primaryContext(dcPath.path(),0);
+                    QOfonoConnectionContextInterface primaryContext(dcPath.path(),0);
                     primaryContext.setActive(false);
                 }
             }
diff --git a/src/plugins/bearer/connman/qofonoservice_linux.cpp b/src/plugins/bearer/connman/qofonoservice_linux.cpp
index f6fb55522e..1983276d94 100644
--- a/src/plugins/bearer/connman/qofonoservice_linux.cpp
+++ b/src/plugins/bearer/connman/qofonoservice_linux.cpp
@@ -108,7 +108,7 @@ QDBusObjectPath QOfonoManagerInterface::currentModem()
     foreach (const QDBusObjectPath &modem, modems) {
         QOfonoModemInterface device(modem.path());
         if (device.isPowered() && device.isOnline())
-        return modem;;
+        return modem;
     }
     return QDBusObjectPath();
 }
@@ -770,7 +770,7 @@ QVariantMap QOfonoDataConnectionManagerInterface::getProperties()
     return reply.value();
 }
 
-QOfonoPrimaryDataContextInterface::QOfonoPrimaryDataContextInterface(const QString &dbusPathName, QObject *parent)
+QOfonoConnectionContextInterface::QOfonoConnectionContextInterface(const QString &dbusPathName, QObject *parent)
     : QDBusAbstractInterface(QLatin1String(OFONO_SERVICE),
                              dbusPathName,
                              OFONO_DATA_CONTEXT_INTERFACE,
@@ -778,68 +778,68 @@ QOfonoPrimaryDataContextInterface::QOfonoPrimaryDataContextInterface(const QStri
 {
 }
 
-QOfonoPrimaryDataContextInterface::~QOfonoPrimaryDataContextInterface()
+QOfonoConnectionContextInterface::~QOfonoConnectionContextInterface()
 {
 }
 
-bool QOfonoPrimaryDataContextInterface::isActive()
+bool QOfonoConnectionContextInterface::isActive()
 {
     QVariant var = getProperty("Active");
     return qdbus_cast<bool>(var);
 }
 
-QString QOfonoPrimaryDataContextInterface::getApName()
+QString QOfonoConnectionContextInterface::getApName()
 {
     QVariant var = getProperty("AccessPointName");
     return qdbus_cast<QString>(var);
 }
 
-QString QOfonoPrimaryDataContextInterface::getType()
+QString QOfonoConnectionContextInterface::getType()
 {
     QVariant var = getProperty("Type");
     return qdbus_cast<QString>(var);
 }
 
-QString QOfonoPrimaryDataContextInterface::getName()
+QString QOfonoConnectionContextInterface::getName()
 {
     QVariant var = getProperty("Name");
     return qdbus_cast<QString>(var);
 }
 
-QVariantMap QOfonoPrimaryDataContextInterface::getSettings()
+QVariantMap QOfonoConnectionContextInterface::getSettings()
 {
     QVariant var = getProperty("Settings");
     return qdbus_cast<QVariantMap>(var);
 }
 
-QString QOfonoPrimaryDataContextInterface::getInterface()
+QString QOfonoConnectionContextInterface::getInterface()
 {
     QVariant var = getProperty("Interface");
     return qdbus_cast<QString>(var);
 }
 
-QString QOfonoPrimaryDataContextInterface::getAddress()
+QString QOfonoConnectionContextInterface::getAddress()
 {
     QVariant var = getProperty("Address");
     return qdbus_cast<QString>(var);
 }
 
-bool QOfonoPrimaryDataContextInterface::setActive(bool on)
+bool QOfonoConnectionContextInterface::setActive(bool on)
 {
 //    this->setProperty("Active", QVariant(on));
 
     return setProp("Active", QVariant::fromValue(on));
 }
 
-bool QOfonoPrimaryDataContextInterface::setApn(const QString &name)
+bool QOfonoConnectionContextInterface::setApn(const QString &name)
 {
     return setProp("AccessPointName", QVariant::fromValue(name));
 }
 
-void QOfonoPrimaryDataContextInterface::connectNotify(const QMetaMethod &signal)
+void QOfonoConnectionContextInterface::connectNotify(const QMetaMethod &signal)
 {
     Q_UNUSED(signal);
-//    static const QMetaMethod propertyChangedSignal = QMetaMethod::fromSignal(&QOfonoPrimaryDataContextInterface::propertyChanged);
+//    static const QMetaMethod propertyChangedSignal = QMetaMethod::fromSignal(&QOfonoConnectionContextInterface::propertyChanged);
 //    if (signal == propertyChangedSignal) {
 //        if (!connection().connect(QLatin1String(OFONO_SERVICE),
 //                               this->path(),
@@ -850,7 +850,7 @@ void QOfonoPrimaryDataContextInterface::connectNotify(const QMetaMethod &signal)
 //        }
 //    }
 
-//    static const QMetaMethod propertyChangedContextSignal = QMetaMethod::fromSignal(&QOfonoPrimaryDataContextInterface::propertyChangedContext);
+//    static const QMetaMethod propertyChangedContextSignal = QMetaMethod::fromSignal(&QOfonoConnectionContextInterface::propertyChangedContext);
 //    if (signal == propertyChangedContextSignal) {
 //        QOfonoDBusHelper *helper;
 //        helper = new QOfonoDBusHelper(this);
@@ -867,16 +867,16 @@ void QOfonoPrimaryDataContextInterface::connectNotify(const QMetaMethod &signal)
 //    }
 }
 
-void QOfonoPrimaryDataContextInterface::disconnectNotify(const QMetaMethod &signal)
+void QOfonoConnectionContextInterface::disconnectNotify(const QMetaMethod &signal)
 {
     Q_UNUSED(signal);
-//    static const QMetaMethod propertyChangedSignal = QMetaMethod::fromSignal(&QOfonoPrimaryDataContextInterface::propertyChanged);
+//    static const QMetaMethod propertyChangedSignal = QMetaMethod::fromSignal(&QOfonoConnectionContextInterface::propertyChanged);
 //    if (signal == propertyChangedSignal) {
 
 //    }
 }
 
-QVariant QOfonoPrimaryDataContextInterface::getProperty(const QString &property)
+QVariant QOfonoConnectionContextInterface::getProperty(const QString &property)
 {
     QVariant var;
     QVariantMap map = getProperties();
@@ -888,13 +888,13 @@ QVariant QOfonoPrimaryDataContextInterface::getProperty(const QString &property)
     return var;
 }
 
-QVariantMap QOfonoPrimaryDataContextInterface::getProperties()
+QVariantMap QOfonoConnectionContextInterface::getProperties()
 {
     QDBusReply<QVariantMap > reply =  this->call(QLatin1String("GetProperties"));
     return reply.value();
 }
 
-bool QOfonoPrimaryDataContextInterface::setProp(const QString &property, const QVariant &var)
+bool QOfonoConnectionContextInterface::setProp(const QString &property, const QVariant &var)
 {
     QList<QVariant> args;
     args << QVariant::fromValue(property) << QVariant::fromValue(QDBusVariant(var));
diff --git a/src/plugins/bearer/connman/qofonoservice_linux_p.h b/src/plugins/bearer/connman/qofonoservice_linux_p.h
index 00be9aa675..c73e8231a2 100644
--- a/src/plugins/bearer/connman/qofonoservice_linux_p.h
+++ b/src/plugins/bearer/connman/qofonoservice_linux_p.h
@@ -76,7 +76,7 @@
 #define OFONO_NETWORK_OPERATOR_INTERFACE         "org.ofono.NetworkOperator"
 #define OFONO_DATA_CONNECTION_MANAGER_INTERFACE  "org.ofono.DataConnectionManager"
 #define OFONO_SIM_MANAGER_INTERFACE              "org.ofono.SimManager"
-#define OFONO_DATA_CONTEXT_INTERFACE             "org.ofono.PrimaryDataContext"
+#define OFONO_DATA_CONTEXT_INTERFACE             "org.ofono.ConnectionContext"
 
 #define OFONO_SMS_MANAGER_INTERFACE              "org.ofono.SmsManager"
 #define OFONO_PHONEBOOK_INTERFACE                "org.ofono.Phonebook"
@@ -281,14 +281,14 @@ protected:
 };
 
 
-class QOfonoPrimaryDataContextInterface : public QDBusAbstractInterface
+class QOfonoConnectionContextInterface : public QDBusAbstractInterface
 {
     Q_OBJECT
 
 public:
 
-    explicit QOfonoPrimaryDataContextInterface(const QString &dbusPathName, QObject *parent = 0);
-    ~QOfonoPrimaryDataContextInterface();
+    explicit QOfonoConnectionContextInterface(const QString &dbusPathName, QObject *parent = 0);
+    ~QOfonoConnectionContextInterface();
 
     QVariantMap getProperties();
 
diff --git a/src/plugins/platforms/cocoa/qcocoabackingstore.mm b/src/plugins/platforms/cocoa/qcocoabackingstore.mm
index a2f6910688..4881dcef71 100644
--- a/src/plugins/platforms/cocoa/qcocoabackingstore.mm
+++ b/src/plugins/platforms/cocoa/qcocoabackingstore.mm
@@ -73,7 +73,9 @@ QPaintDevice *QCocoaBackingStore::paintDevice()
         }
 #endif
 
-        m_qImage = QImage(m_requestedSize * scaleFactor, QImage::Format_ARGB32_Premultiplied);
+        QImage::Format format = window()->format().hasAlpha()
+                ? QImage::Format_ARGB32_Premultiplied : QImage::Format_RGB32;
+        m_qImage = QImage(m_requestedSize * scaleFactor, format);
         m_qImage.setDevicePixelRatio(scaleFactor);
     }
     return &m_qImage;
@@ -92,7 +94,7 @@ void QCocoaBackingStore::flush(QWindow *win, const QRegion &region, const QPoint
     m_cgImage = 0;
     if (!m_qImage.isNull()) {
         if (QCocoaWindow *cocoaWindow = static_cast<QCocoaWindow *>(win->handle()))
-            [cocoaWindow->m_contentView flushBackingStore:this region:region offset:offset];
+            [cocoaWindow->m_qtView flushBackingStore:this region:region offset:offset];
     }
 }
 
diff --git a/src/plugins/platforms/cocoa/qcocoaintegration.mm b/src/plugins/platforms/cocoa/qcocoaintegration.mm
index f33d4cb68b..d0fcf93b8c 100644
--- a/src/plugins/platforms/cocoa/qcocoaintegration.mm
+++ b/src/plugins/platforms/cocoa/qcocoaintegration.mm
@@ -172,13 +172,13 @@ QPixmap QCocoaScreen::grabWindow(WId window, int x, int y, int width, int height
             windowSize.setHeight(windowRect.height());
     }
 
-    QPixmap windowPixmap(windowSize);
+    QPixmap windowPixmap(windowSize * devicePixelRatio());
     windowPixmap.fill(Qt::transparent);
 
     for (uint i = 0; i < displayCount; ++i) {
         const CGRect bounds = CGDisplayBounds(displays[i]);
-        int w = (width < 0 ? bounds.size.width : width);
-        int h = (height < 0 ? bounds.size.height : height);
+        int w = (width < 0 ? bounds.size.width : width) * devicePixelRatio();
+        int h = (height < 0 ? bounds.size.height : height) * devicePixelRatio();
         QRect displayRect = QRect(x, y, w, h);
         QCFType<CGImageRef> image = CGDisplayCreateImageForRect(displays[i],
             CGRectMake(displayRect.x(), displayRect.y(), displayRect.width(), displayRect.height()));
diff --git a/src/plugins/platforms/cocoa/qcocoamenubar.mm b/src/plugins/platforms/cocoa/qcocoamenubar.mm
index bae52c91b8..c0c8caed05 100644
--- a/src/plugins/platforms/cocoa/qcocoamenubar.mm
+++ b/src/plugins/platforms/cocoa/qcocoamenubar.mm
@@ -77,8 +77,10 @@ QCocoaMenuBar::~QCocoaMenuBar()
     [m_nativeMenu release];
     static_menubars.removeOne(this);
 
-    if (m_window)
+    if (m_window && m_window->menubar() == this) {
         m_window->setMenubar(0);
+        updateMenuBarImmediately();
+    }
 }
 
 void QCocoaMenuBar::insertMenu(QPlatformMenu *platformMenu, QPlatformMenu *before)
diff --git a/src/plugins/platforms/cocoa/qcocoamenuitem.mm b/src/plugins/platforms/cocoa/qcocoamenuitem.mm
index d78ff73bb6..bdcad6f490 100644
--- a/src/plugins/platforms/cocoa/qcocoamenuitem.mm
+++ b/src/plugins/platforms/cocoa/qcocoamenuitem.mm
@@ -315,9 +315,12 @@ NSMenuItem *QCocoaMenuItem::sync()
     return m_native;
 }
 
+QT_BEGIN_NAMESPACE
+extern QString qt_mac_applicationmenu_string(int type);
+QT_END_NAMESPACE
+
 QString QCocoaMenuItem::mergeText()
 {
-    extern QString qt_mac_applicationmenu_string(int type);
     QT_MANGLE_NAMESPACE(QCocoaMenuLoader) *loader = getMenuLoader();
     if (m_native == [loader aboutMenuItem]) {
         return qt_mac_applicationmenu_string(6).arg(qt_mac_applicationName());
diff --git a/src/plugins/platforms/cocoa/qcocoanativeinterface.h b/src/plugins/platforms/cocoa/qcocoanativeinterface.h
index 9506f86238..2f79b49534 100644
--- a/src/plugins/platforms/cocoa/qcocoanativeinterface.h
+++ b/src/plugins/platforms/cocoa/qcocoanativeinterface.h
@@ -102,6 +102,9 @@ private:
     // QImage <-> CGImage conversion functions
     static CGImageRef qImageToCGImage(const QImage &image);
     static QImage cgImageToQImage(CGImageRef image);
+
+    // Embedding NSViews as child QWindows
+    static void setWindowContentView(QPlatformWindow *window, void *nsViewContentView);
 };
 
 #endif // QCOCOANATIVEINTERFACE_H
diff --git a/src/plugins/platforms/cocoa/qcocoanativeinterface.mm b/src/plugins/platforms/cocoa/qcocoanativeinterface.mm
index bd3a909137..9990537c1f 100644
--- a/src/plugins/platforms/cocoa/qcocoanativeinterface.mm
+++ b/src/plugins/platforms/cocoa/qcocoanativeinterface.mm
@@ -113,6 +113,8 @@ QPlatformNativeInterface::NativeResourceForIntegrationFunction QCocoaNativeInter
         return NativeResourceForIntegrationFunction(QCocoaNativeInterface::qImageToCGImage);
     if (resource.toLower() == "cgimagetoqimage")
         return NativeResourceForIntegrationFunction(QCocoaNativeInterface::cgImageToQImage);
+    if (resource.toLower() == "setwindowcontentview")
+        return NativeResourceForIntegrationFunction(QCocoaNativeInterface::setWindowContentView);
 
     return 0;
 }
@@ -198,5 +200,10 @@ QImage QCocoaNativeInterface::cgImageToQImage(CGImageRef image)
     return qt_mac_toQImage(image);
 }
 
+void QCocoaNativeInterface::setWindowContentView(QPlatformWindow *window, void *contentView)
+{
+    QCocoaWindow *cocoaPlatformWindow = static_cast<QCocoaWindow *>(window);
+    cocoaPlatformWindow->setContentView(reinterpret_cast<NSView *>(contentView));
+}
 
 QT_END_NAMESPACE
diff --git a/src/plugins/platforms/cocoa/qcocoaservices.mm b/src/plugins/platforms/cocoa/qcocoaservices.mm
index dea23e7e53..e4cec8c5f8 100644
--- a/src/plugins/platforms/cocoa/qcocoaservices.mm
+++ b/src/plugins/platforms/cocoa/qcocoaservices.mm
@@ -55,7 +55,7 @@ bool QCocoaServices::openUrl(const QUrl &url)
     const QString scheme = url.scheme();
     if (scheme.isEmpty())
         return openDocument(url);
-    return [[NSWorkspace sharedWorkspace] openURL:[NSURL URLWithString:QT_PREPEND_NAMESPACE(QCFString::toNSString)(url.toString())]];
+    return [[NSWorkspace sharedWorkspace] openURL:[NSURL URLWithString:QT_PREPEND_NAMESPACE(QCFString::toNSString)(url.toString(QUrl::FullyEncoded))]];
 }
 
 bool QCocoaServices::openDocument(const QUrl &url)
diff --git a/src/plugins/platforms/cocoa/qcocoawindow.h b/src/plugins/platforms/cocoa/qcocoawindow.h
index 70df7451f7..84dcaad206 100644
--- a/src/plugins/platforms/cocoa/qcocoawindow.h
+++ b/src/plugins/platforms/cocoa/qcocoawindow.h
@@ -121,6 +121,7 @@ public:
     void setParent(const QPlatformWindow *window);
 
     NSView *contentView() const;
+    void setContentView(NSView *contentView);
 
     void windowWillMove();
     void windowDidMove();
@@ -164,8 +165,11 @@ public: // for QNSView
     friend class QCocoaBackingStore;
     friend class QCocoaNativeInterface;
 
-    QNSView *m_contentView;
+    NSView *m_contentView;
+    QNSView *m_qtView;
     NSWindow *m_nsWindow;
+    bool m_contentViewIsEmbedded; // true if the m_contentView is embedded in a "foregin" NSView hiearchy
+
     QNSWindowDelegate *m_nsWindowDelegate;
     Qt::WindowFlags m_windowFlags;
     Qt::WindowState m_synchedWindowState;
diff --git a/src/plugins/platforms/cocoa/qcocoawindow.mm b/src/plugins/platforms/cocoa/qcocoawindow.mm
index fe6a9ad50b..4c58c22644 100644
--- a/src/plugins/platforms/cocoa/qcocoawindow.mm
+++ b/src/plugins/platforms/cocoa/qcocoawindow.mm
@@ -58,6 +58,11 @@
 
 #include <QDebug>
 
+enum {
+    defaultWindowWidth = 160,
+    defaultWindowHeight = 160
+};
+
 static bool isMouseEvent(NSEvent *ev)
 {
     switch ([ev type]) {
@@ -186,6 +191,7 @@ static bool isMouseEvent(NSEvent *ev)
 QCocoaWindow::QCocoaWindow(QWindow *tlw)
     : QPlatformWindow(tlw)
     , m_nsWindow(0)
+    , m_contentViewIsEmbedded(false)
     , m_nsWindowDelegate(0)
     , m_synchedWindowState(Qt::WindowActive)
     , m_windowModality(Qt::NonModal)
@@ -200,7 +206,8 @@ QCocoaWindow::QCocoaWindow(QWindow *tlw)
 #endif
     QCocoaAutoReleasePool pool;
 
-    m_contentView = [[QNSView alloc] initWithQWindow:tlw platformWindow:this];
+    m_qtView = [[QNSView alloc] initWithQWindow:tlw platformWindow:this];
+    m_contentView = m_qtView;
     setGeometry(tlw->geometry());
 
     recreateWindow(parent());
@@ -237,6 +244,10 @@ void QCocoaWindow::setGeometry(const QRect &rect)
 void QCocoaWindow::setCocoaGeometry(const QRect &rect)
 {
     QCocoaAutoReleasePool pool;
+
+    if (m_contentViewIsEmbedded)
+        return;
+
     if (m_nsWindow) {
         NSRect bounds = qt_mac_flipRect(rect, window());
         [m_nsWindow setContentSize : bounds.size];
@@ -538,7 +549,7 @@ void QCocoaWindow::setMask(const QRegion &region)
     if (m_nsWindow)
         [m_nsWindow setBackgroundColor:[NSColor clearColor]];
 
-    [m_contentView setMaskRegion:&region];
+    [m_qtView setMaskRegion:&region];
     updateOpaque();
 }
 
@@ -583,6 +594,19 @@ NSView *QCocoaWindow::contentView() const
     return m_contentView;
 }
 
+void QCocoaWindow::setContentView(NSView *contentView)
+{
+    // Remove and release the previous content view
+    [m_contentView removeFromSuperview];
+    [m_contentView release];
+
+    // Insert and retain the new content view
+    [contentView retain];
+    m_contentView = contentView;
+    m_qtView = 0; // The new content view is not a QNSView.
+    recreateWindow(parent()); // Adds the content view to parent NSView
+}
+
 void QCocoaWindow::windowWillMove()
 {
     // Close any open popups on window move
@@ -595,7 +619,7 @@ void QCocoaWindow::windowWillMove()
 
 void QCocoaWindow::windowDidMove()
 {
-    [m_contentView updateGeometry];
+    [m_qtView updateGeometry];
 }
 
 void QCocoaWindow::windowDidResize()
@@ -603,7 +627,7 @@ void QCocoaWindow::windowDidResize()
     if (!m_nsWindow)
         return;
 
-    [m_contentView updateGeometry];
+    [m_qtView updateGeometry];
 }
 
 void QCocoaWindow::windowWillClose()
@@ -644,7 +668,9 @@ void QCocoaWindow::recreateWindow(const QPlatformWindow *parentWindow)
         m_nsWindowDelegate = 0;
     }
 
-    if (!parentWindow) {
+    if (window()->type() == Qt::SubWindow) {
+        // Subwindows don't have a NSWindow.
+    } else if (!parentWindow) {
         // Create a new NSWindow if this is a top-level window.
         m_nsWindow = createNSWindow();
         setNSWindow(m_nsWindow);
@@ -679,7 +705,8 @@ NSWindow * QCocoaWindow::createNSWindow()
 {
     QCocoaAutoReleasePool pool;
 
-    NSRect frame = qt_mac_flipRect(window()->geometry(), window());
+    QRect rect = initialGeometry(window(), window()->geometry(), defaultWindowWidth, defaultWindowHeight);
+    NSRect frame = qt_mac_flipRect(rect, window());
 
     Qt::WindowType type = window()->type();
     Qt::WindowFlags flags = window()->flags();
diff --git a/src/plugins/platforms/cocoa/qnsview.mm b/src/plugins/platforms/cocoa/qnsview.mm
index a8d8baa942..8f88387966 100644
--- a/src/plugins/platforms/cocoa/qnsview.mm
+++ b/src/plugins/platforms/cocoa/qnsview.mm
@@ -173,6 +173,36 @@ static QTouchDevice *touchDevice = 0;
     QWindowSystemInterface::handleExposeEvent(m_window, m_window->geometry());
 }
 
+- (void)viewDidMoveToSuperview
+{
+    if (!(m_window->type() & Qt::SubWindow))
+        return;
+
+    if ([self superview]) {
+        m_platformWindow->m_contentViewIsEmbedded = true;
+        QWindowSystemInterface::handleGeometryChange(m_window, m_platformWindow->geometry());
+        QWindowSystemInterface::handleExposeEvent(m_window, m_platformWindow->geometry());
+        QWindowSystemInterface::flushWindowSystemEvents();
+    } else {
+        m_platformWindow->m_contentViewIsEmbedded = false;
+    }
+}
+
+- (void)viewWillMoveToWindow:(NSWindow *)newWindow
+{
+    // ### Merge "normal" window code path with this one for 5.1.
+    if (!(m_window->type() & Qt::SubWindow))
+        return;
+
+    if (newWindow) {
+        [[NSNotificationCenter defaultCenter] addObserver:self
+                                              selector:@selector(windowNotification:)
+                                              name:nil // Get all notifications
+                                              object:newWindow];
+    } else {
+        [[NSNotificationCenter defaultCenter] removeObserver:self name:nil object:[self window]];
+    }
+}
 - (void)updateGeometry
 {
     QRect geometry;
@@ -181,6 +211,9 @@ static QTouchDevice *touchDevice = 0;
         NSRect rect = [self frame];
         NSRect windowRect = [[self window] frame];
         geometry = QRect(windowRect.origin.x, qt_mac_flipYCoordinate(windowRect.origin.y + rect.size.height), rect.size.width, rect.size.height);
+    } else if (m_window->type() & Qt::SubWindow) {
+        // embedded child window, use the frame rect ### merge with case below
+        geometry = qt_mac_toQRect([self bounds]);
     } else {
         // child window, use the frame rect
         geometry = qt_mac_toQRect([self frame]);
@@ -198,6 +231,12 @@ static QTouchDevice *touchDevice = 0;
     // an infinite loop when this notification is triggered again.)
     m_platformWindow->QPlatformWindow::setGeometry(geometry);
 
+    // Don't send the geometry change if the QWindow is designated to be
+    // embedded in a foregin view hiearchy but has not actually been
+    // embedded yet - it's too early.
+    if ((m_window->type() & Qt::SubWindow) && !m_platformWindow->m_contentViewIsEmbedded)
+        return;
+
     // Send a geometry change event to Qt, if it's ready to handle events
     if (!m_platformWindow->m_inConstructor) {
         QWindowSystemInterface::handleGeometryChange(m_window, geometry);
@@ -322,7 +361,12 @@ static QTouchDevice *touchDevice = 0;
     );
     CGImageRef bsCGImage = m_backingStore->getBackingStoreCGImage();
     CGImageRef cleanImg = CGImageCreateWithImageInRect(bsCGImage, backingStoreRect);
-    CGContextSetBlendMode(cgContext, kCGBlendModeCopy);
+
+    // Optimization: Copy frame buffer content instead of blending for
+    // top-level windows where Qt fills the entire window content area.
+    if (m_platformWindow->m_nsWindow)
+        CGContextSetBlendMode(cgContext, kCGBlendModeCopy);
+
     CGContextDrawImage(cgContext, dirtyWindowRect, cleanImg);
 
     // Clean-up:
diff --git a/src/plugins/platforms/qnx/qqnxwindow.cpp b/src/plugins/platforms/qnx/qqnxwindow.cpp
index ab9c94772b..43e24034c9 100644
--- a/src/plugins/platforms/qnx/qqnxwindow.cpp
+++ b/src/plugins/platforms/qnx/qqnxwindow.cpp
@@ -272,9 +272,9 @@ void QQnxWindow::setVisible(bool visible)
     window()->requestActivate();
 
     if (window()->isTopLevel()) {
-        if (visible) {
-            QWindowSystemInterface::handleExposeEvent(window(), window()->geometry());
-        } else {
+        QWindowSystemInterface::handleExposeEvent(window(), window()->geometry());
+
+        if (!visible) {
             // Flush the context, otherwise it won't disappear immediately
             screen_flush_context(m_screenContext, 0);
         }
diff --git a/src/plugins/platforms/windows/qwindowscontext.cpp b/src/plugins/platforms/windows/qwindowscontext.cpp
index a6709dffb3..f824666a54 100644
--- a/src/plugins/platforms/windows/qwindowscontext.cpp
+++ b/src/plugins/platforms/windows/qwindowscontext.cpp
@@ -849,10 +849,10 @@ bool QWindowsContext::windowsProc(HWND hwnd, UINT message,
         return true;
     case QtWindows::ShowEvent:
         platformWindow->handleShown();
-        return true;
+        return false; // Indicate transient children should be shown by windows (SW_PARENTOPENING)
     case QtWindows::HideEvent:
         platformWindow->handleHidden();
-        return true;
+        return false;// Indicate transient children should be hidden by windows (SW_PARENTCLOSING)
     case QtWindows::CloseEvent:
         QWindowSystemInterface::handleCloseEvent(platformWindow->window());
         return true;
diff --git a/src/plugins/platforms/windows/qwindowsintegration.h b/src/plugins/platforms/windows/qwindowsintegration.h
index 24dc01f0bd..ca484415be 100644
--- a/src/plugins/platforms/windows/qwindowsintegration.h
+++ b/src/plugins/platforms/windows/qwindowsintegration.h
@@ -78,7 +78,7 @@ public:
 #  ifndef QT_NO_DRAGANDDROP
     virtual QPlatformDrag *drag() const;
 #  endif
-#endif !QT_NO_CLIPBOARD
+#endif // !QT_NO_CLIPBOARD
     virtual QPlatformInputContext *inputContext() const;
 #ifndef QT_NO_ACCESSIBILITY
     virtual QPlatformAccessibility *accessibility() const;
diff --git a/src/plugins/platforms/windows/qwindowswindow.cpp b/src/plugins/platforms/windows/qwindowswindow.cpp
index cecbd81214..bb0092cd54 100644
--- a/src/plugins/platforms/windows/qwindowswindow.cpp
+++ b/src/plugins/platforms/windows/qwindowswindow.cpp
@@ -64,6 +64,11 @@
 
 QT_BEGIN_NAMESPACE
 
+enum {
+    defaultWindowWidth = 160,
+    defaultWindowHeight = 160
+};
+
 Q_GUI_EXPORT HICON qt_pixmapToWinHICON(const QPixmap &);
 
 static QByteArray debugWinStyle(DWORD style)
@@ -198,17 +203,16 @@ static inline QSize clientSize(HWND hwnd)
     return qSizeOfRect(rect);
 }
 
-// from qwidget_win.cpp/maximum layout size check removed.
-static bool shouldShowMaximizeButton(Qt::WindowFlags flags)
+// from qwidget_win.cpp
+static bool shouldShowMaximizeButton(const QWindow *w)
 {
-    if (flags & Qt::MSWindowsFixedSizeDialogHint)
+    const Qt::WindowFlags flags = w->flags();
+    if ((flags & Qt::MSWindowsFixedSizeDialogHint) || !(flags & Qt::WindowMaximizeButtonHint))
         return false;
     // if the user explicitly asked for the maximize button, we try to add
     // it even if the window has fixed size.
-    if (flags & Qt::CustomizeWindowHint &&
-        flags & Qt::WindowMaximizeButtonHint)
-        return true;
-    return flags & Qt::WindowMaximizeButtonHint;
+    return (flags & Qt::CustomizeWindowHint) ||
+        w->maximumSize() == QSize(QWINDOWSIZE_MAX, QWINDOWSIZE_MAX);
 }
 
 // Set the WS_EX_LAYERED flag on a HWND if required. This is required for
@@ -427,7 +431,7 @@ void WindowCreationData::fromWindow(const QWindow *w, const Qt::WindowFlags flag
                     style |= WS_SYSMENU;
                 if (flags & Qt::WindowMinimizeButtonHint)
                     style |= WS_MINIMIZEBOX;
-                if (shouldShowMaximizeButton(flags))
+                if (shouldShowMaximizeButton(w))
                     style |= WS_MAXIMIZEBOX;
                 if (tool)
                     exStyle |= WS_EX_TOOLWINDOW;
@@ -468,6 +472,8 @@ QWindowsWindow::WindowData
 
     const QString windowClassName = QWindowsContext::instance()->registerWindowClass(w, isGL);
 
+    QRect rect = QPlatformWindow::initialGeometry(w, data.geometry, defaultWindowWidth, defaultWindowHeight);
+
     if (title.isEmpty() && (result.flags & Qt::WindowTitleHint))
         title = topLevel ? qAppName() : w->objectName();
 
@@ -476,14 +482,14 @@ QWindowsWindow::WindowData
 
     // Capture events before CreateWindowEx() returns. The context is cleared in
     // the QWindowsWindow constructor.
-    const QWindowCreationContextPtr context(new QWindowCreationContext(w, data.geometry, data.customMargins, style, exStyle));
+    const QWindowCreationContextPtr context(new QWindowCreationContext(w, rect, data.customMargins, style, exStyle));
     QWindowsContext::instance()->setWindowCreationContext(context);
 
     if (QWindowsContext::verboseWindows)
         qDebug().nospace()
                 << "CreateWindowEx: " << w << *this
                 << " class=" <<windowClassName << " title=" << title
-                << "\nrequested: " << data.geometry << ": "
+                << "\nrequested: " << rect << ": "
                 << context->frameWidth << 'x' <<  context->frameHeight
                 << '+' << context->frameX << '+' << context->frameY
                 << " custom margins: " << context->customMargins;
@@ -810,6 +816,7 @@ QWindowsWindow::QWindowsWindow(QWindow *aWindow, const WindowData &data) :
 QWindowsWindow::~QWindowsWindow()
 {
 #ifndef Q_OS_WINCE
+    QWindowSystemInterface::flushWindowSystemEvents();
     if (QWindowsContext::instance()->systemInfo() & QWindowsContext::SI_SupportsTouch)
         QWindowsContext::user32dll.unregisterTouchWindow(m_data.hwnd);
 #endif // !Q_OS_WINCE
diff --git a/src/plugins/platforms/xcb/qglxintegration.cpp b/src/plugins/platforms/xcb/qglxintegration.cpp
index 2b18ecf7a4..5efac6ce12 100644
--- a/src/plugins/platforms/xcb/qglxintegration.cpp
+++ b/src/plugins/platforms/xcb/qglxintegration.cpp
@@ -105,57 +105,6 @@ static Window createDummyWindow(QXcbScreen *screen, GLXFBConfig config)
     return window;
 }
 
-// Per-window data for active OpenGL contexts.
-struct QOpenGLContextData
-{
-    QOpenGLContextData(Display *display, Window window, GLXContext context)
-        : m_display(display),
-          m_window(window),
-          m_context(context)
-    {}
-
-    QOpenGLContextData()
-        : m_display(0),
-          m_window(0),
-          m_context(0)
-    {}
-
-    Display *m_display;
-    Window m_window;
-    GLXContext m_context;
-};
-
-static inline QOpenGLContextData currentOpenGLContextData()
-{
-    QOpenGLContextData result;
-    result.m_display = glXGetCurrentDisplay();
-    result.m_window = glXGetCurrentDrawable();
-    result.m_context = glXGetCurrentContext();
-    return result;
-}
-
-static inline QOpenGLContextData createDummyWindowOpenGLContextData(QXcbScreen *screen)
-{
-    QOpenGLContextData result;
-    result.m_display = DISPLAY_FROM_XCB(screen);
-
-    QSurfaceFormat format;
-    GLXFBConfig config = qglx_findConfig(DISPLAY_FROM_XCB(screen), screen->screenNumber(), format);
-    if (config) {
-        result.m_context = glXCreateNewContext(DISPLAY_FROM_XCB(screen), config, GLX_RGBA_TYPE, 0, true);
-        result.m_window = createDummyWindow(screen, config);
-    } else {
-        XVisualInfo *visualInfo = qglx_findVisualInfo(DISPLAY_FROM_XCB(screen), screen->screenNumber(), &format);
-        if (!visualInfo)
-            qFatal("Could not initialize GLX");
-        result.m_context = glXCreateContext(DISPLAY_FROM_XCB(screen), visualInfo, 0, true);
-        result.m_window = createDummyWindow(screen, visualInfo);
-        XFree(visualInfo);
-    }
-
-    return result;
-}
-
 static inline QByteArray getGlString(GLenum param)
 {
     if (const GLubyte *s = glGetString(param))
@@ -203,70 +152,7 @@ static void updateFormatFromContext(QSurfaceFormat &format)
         format.setProfile(QSurfaceFormat::CompatibilityProfile);
 }
 
-/*!
-    \class QOpenGLTemporaryContext
-    \brief A temporary context that can be instantiated on the stack.
-
-    Functions like glGetString() only work if there is a current GL context.
-
-    \internal
-    \ingroup qt-lighthouse-xcb
-*/
-class QOpenGLTemporaryContext
-{
-    Q_DISABLE_COPY(QOpenGLTemporaryContext)
-public:
-    QOpenGLTemporaryContext(QXcbScreen *screen);
-    ~QOpenGLTemporaryContext();
-
-private:
-    const QOpenGLContextData m_previous;
-    const QOpenGLContextData m_current;
-};
-
-QOpenGLTemporaryContext::QOpenGLTemporaryContext(QXcbScreen *screen)
-    : m_previous(currentOpenGLContextData()),
-      m_current(createDummyWindowOpenGLContextData(screen))
-{
-    // Make our temporary context current on our temporary window
-    glXMakeCurrent(m_current.m_display, m_current.m_window, m_current.m_context);
-}
-
-QOpenGLTemporaryContext::~QOpenGLTemporaryContext()
-{
-    // Restore the previous context if possible, otherwise just release our temporary context
-    if (m_previous.m_display)
-        glXMakeCurrent(m_previous.m_display, m_previous.m_window, m_previous.m_context);
-    else
-        glXMakeCurrent(m_current.m_display, 0, 0);
-
-    // Destroy our temporary window
-    XDestroyWindow(m_current.m_display, m_current.m_window);
-
-    // Finally destroy our temporary context itself
-    glXDestroyContext(m_current.m_display, m_current.m_context);
-}
-
-QOpenGLDefaultContextInfo::QOpenGLDefaultContextInfo()
-    : vendor(getGlString(GL_VENDOR)),
-      renderer(getGlString(GL_RENDERER))
-{
-    updateFormatFromContext(format);
-}
-
-QOpenGLDefaultContextInfo *QOpenGLDefaultContextInfo::create(QXcbScreen *screen)
-{
-    // We need a current context for getGLString() to work. To have
-    // the QOpenGLDefaultContextInfo contain the latest supported
-    // context version, we rely upon the QOpenGLTemporaryContext to
-    // correctly obtain a context with the latest version
-    QScopedPointer<QOpenGLTemporaryContext> temporaryContext(new QOpenGLTemporaryContext(screen));
-    QOpenGLDefaultContextInfo *result = new QOpenGLDefaultContextInfo;
-    return result;
-}
-
-
-QGLXContext::QGLXContext(QXcbScreen *screen, const QSurfaceFormat &format, QPlatformOpenGLContext *share, QOpenGLDefaultContextInfo *defaultContextInfo)
+QGLXContext::QGLXContext(QXcbScreen *screen, const QSurfaceFormat &format, QPlatformOpenGLContext *share)
     : QPlatformOpenGLContext()
     , m_screen(screen)
     , m_context(0)
@@ -294,51 +180,60 @@ QGLXContext::QGLXContext(QXcbScreen *screen, const QSurfaceFormat &format, QPlat
         QList<QByteArray> glxExt = QByteArray(glXQueryExtensionsString(DISPLAY_FROM_XCB(m_screen), m_screen->screenNumber())).split(' ');
         bool supportsProfiles = glxExt.contains("GLX_ARB_create_context_profile");
 
-        // Use glXCreateContextAttribsARB if is available
+        // Use glXCreateContextAttribsARB if available
         if (glxExt.contains("GLX_ARB_create_context") && glXCreateContextAttribsARB != 0) {
-            // We limit the requested version by the version of the static context as
-            // glXCreateContextAttribsARB fails and returns NULL if the requested context
-            // version is not supported. This means that we will get the closest supported
-            // context format that that which was requested and is supported by the driver
-            const int maxSupportedVersion = (defaultContextInfo->format.majorVersion() << 8)
-                                          + defaultContextInfo->format.minorVersion();
-            const int requestedVersion = qMin((m_format.majorVersion() << 8) + m_format.minorVersion(),
-                                               maxSupportedVersion);
-            const int majorVersion = requestedVersion >> 8;
-            const int minorVersion = requestedVersion & 0xFF;
-
-            QVector<int> contextAttributes;
-            contextAttributes << GLX_CONTEXT_MAJOR_VERSION_ARB << majorVersion
-                              << GLX_CONTEXT_MINOR_VERSION_ARB << minorVersion;
-
-            // If asking for OpenGL 3.2 or newer we should also specify a profile
-            if (supportsProfiles && (m_format.majorVersion() > 3 || (m_format.majorVersion() == 3 && m_format.minorVersion() > 1))) {
-                if (m_format.profile() == QSurfaceFormat::CoreProfile)
-                    contextAttributes << GLX_CONTEXT_PROFILE_MASK_ARB << GLX_CONTEXT_CORE_PROFILE_BIT_ARB;
-                else
-                    contextAttributes << GLX_CONTEXT_PROFILE_MASK_ARB << GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB;
-            }
-
-            int flags = 0;
-
-            if (m_format.testOption(QSurfaceFormat::DebugContext))
-                flags |= GLX_CONTEXT_DEBUG_BIT_ARB;
-
-            // A forward-compatible context may be requested for 3.0 and later
-            if (m_format.majorVersion() >= 3 && !m_format.testOption(QSurfaceFormat::DeprecatedFunctions))
-                flags |= GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB;
-
-            if (flags != 0)
-                contextAttributes << GLX_CONTEXT_FLAGS_ARB << flags;
-
-            contextAttributes << None;
-
-            m_context = glXCreateContextAttribsARB(DISPLAY_FROM_XCB(screen), config, m_shareContext, true, contextAttributes.data());
-            if (!m_context && m_shareContext) {
-                // re-try without a shared glx context
-                m_context = glXCreateContextAttribsARB(DISPLAY_FROM_XCB(screen), config, 0, true, contextAttributes.data());
-                if (m_context)
-                    m_shareContext = 0;
+            // Try to create an OpenGL context for each known OpenGL version in descending
+            // order from the requested version.
+            const int requestedVersion = format.majorVersion() * 10 + qMin(format.minorVersion(), 9);
+
+            QVector<int> glVersions;
+            if (requestedVersion > 43)
+                glVersions << requestedVersion;
+
+            // Don't bother with versions below 2.0
+            glVersions << 43 << 42 << 41 << 40 << 33 << 32 << 31 << 30 << 21 << 20;
+
+            for (int i = 0; !m_context && i < glVersions.count(); i++) {
+                const int version = glVersions[i];
+                if (version > requestedVersion)
+                    continue;
+
+                const int majorVersion = version / 10;
+                const int minorVersion = version % 10;
+
+                QVector<int> contextAttributes;
+                contextAttributes << GLX_CONTEXT_MAJOR_VERSION_ARB << majorVersion
+                                  << GLX_CONTEXT_MINOR_VERSION_ARB << minorVersion;
+
+                // If asking for OpenGL 3.2 or newer we should also specify a profile
+                if (version >= 32 && supportsProfiles) {
+                    if (m_format.profile() == QSurfaceFormat::CoreProfile)
+                        contextAttributes << GLX_CONTEXT_PROFILE_MASK_ARB << GLX_CONTEXT_CORE_PROFILE_BIT_ARB;
+                    else
+                        contextAttributes << GLX_CONTEXT_PROFILE_MASK_ARB << GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB;
+                }
+
+                int flags = 0;
+
+                if (m_format.testOption(QSurfaceFormat::DebugContext))
+                    flags |= GLX_CONTEXT_DEBUG_BIT_ARB;
+
+                // A forward-compatible context may be requested for 3.0 and later
+                if (version >= 30 && !m_format.testOption(QSurfaceFormat::DeprecatedFunctions))
+                    flags |= GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB;
+
+                if (flags != 0)
+                    contextAttributes << GLX_CONTEXT_FLAGS_ARB << flags;
+
+                contextAttributes << None;
+
+                m_context = glXCreateContextAttribsARB(DISPLAY_FROM_XCB(screen), config, m_shareContext, true, contextAttributes.data());
+                if (!m_context && m_shareContext) {
+                    // re-try without a shared glx context
+                    m_context = glXCreateContextAttribsARB(DISPLAY_FROM_XCB(screen), config, 0, true, contextAttributes.data());
+                    if (m_context)
+                        m_shareContext = 0;
+                }
             }
         }
 
diff --git a/src/plugins/platforms/xcb/qglxintegration.h b/src/plugins/platforms/xcb/qglxintegration.h
index d10b1d441b..7116b2389d 100644
--- a/src/plugins/platforms/xcb/qglxintegration.h
+++ b/src/plugins/platforms/xcb/qglxintegration.h
@@ -55,23 +55,10 @@
 
 QT_BEGIN_NAMESPACE
 
-class QOpenGLDefaultContextInfo
-{
-    Q_DISABLE_COPY(QOpenGLDefaultContextInfo)
-    QOpenGLDefaultContextInfo();
-public:
-    static QOpenGLDefaultContextInfo *create(QXcbScreen *screen);
-
-    const QByteArray vendor;
-    const QByteArray renderer;
-    QSurfaceFormat format;
-};
-
-
 class QGLXContext : public QPlatformOpenGLContext
 {
 public:
-    QGLXContext(QXcbScreen *xd, const QSurfaceFormat &format, QPlatformOpenGLContext *share, QOpenGLDefaultContextInfo *defaultContextInfo);
+    QGLXContext(QXcbScreen *xd, const QSurfaceFormat &format, QPlatformOpenGLContext *share);
     ~QGLXContext();
 
     bool makeCurrent(QPlatformSurface *surface);
diff --git a/src/plugins/platforms/xcb/qxcbconnection.cpp b/src/plugins/platforms/xcb/qxcbconnection.cpp
index a36f823b7c..2467eb6e7a 100644
--- a/src/plugins/platforms/xcb/qxcbconnection.cpp
+++ b/src/plugins/platforms/xcb/qxcbconnection.cpp
@@ -222,7 +222,6 @@ void QXcbConnection::updateScreens()
     // Delete any existing screens which are not in activeScreens
     for (int i = m_screens.count() - 1; i >= 0; --i) {
         if (!activeScreens.contains(m_screens[i])) {
-            ((QXcbIntegration*)QGuiApplicationPrivate::platformIntegration())->removeDefaultOpenGLContextInfo(m_screens[i]);
             delete m_screens[i];
             m_screens.removeAt(i);
         }
diff --git a/src/plugins/platforms/xcb/qxcbintegration.cpp b/src/plugins/platforms/xcb/qxcbintegration.cpp
index d0b0ab8d02..0a02ea02af 100644
--- a/src/plugins/platforms/xcb/qxcbintegration.cpp
+++ b/src/plugins/platforms/xcb/qxcbintegration.cpp
@@ -123,9 +123,6 @@ QXcbIntegration::QXcbIntegration(const QStringList &parameters)
 
 QXcbIntegration::~QXcbIntegration()
 {
-#if !defined(QT_NO_OPENGL) && defined(XCB_USE_GLX)
-    qDeleteAll(m_defaultContextInfos);
-#endif
     qDeleteAll(m_connections);
 }
 
@@ -186,14 +183,7 @@ QPlatformOpenGLContext *QXcbIntegration::createPlatformOpenGLContext(QOpenGLCont
 {
     QXcbScreen *screen = static_cast<QXcbScreen *>(context->screen()->handle());
 #if defined(XCB_USE_GLX)
-    QOpenGLDefaultContextInfo *defaultContextInfo;
-    if (m_defaultContextInfos.contains(screen)) {
-        defaultContextInfo = m_defaultContextInfos.value(screen);
-    } else {
-        defaultContextInfo = QOpenGLDefaultContextInfo::create(screen);
-        m_defaultContextInfos.insert(screen, defaultContextInfo);
-    }
-    return new QGLXContext(screen, context->format(), context->shareHandle(), defaultContextInfo);
+    return new QGLXContext(screen, context->format(), context->shareHandle());
 #elif defined(XCB_USE_EGL)
     return new QEGLXcbPlatformContext(context->format(), context->shareHandle(),
         screen->connection()->egl_display(), screen->connection());
@@ -312,21 +302,4 @@ QPlatformTheme *QXcbIntegration::createPlatformTheme(const QString &name) const
     return QGenericUnixTheme::createUnixTheme(name);
 }
 
-/*!
-  Called by QXcbConnection prior to a QQnxScreen being deleted.
-
-  Destroys and cleans up any default OpenGL context info for this screen.
-*/
-void QXcbIntegration::removeDefaultOpenGLContextInfo(QXcbScreen *screen)
-{
-#if !defined(QT_NO_OPENGL) && defined(XCB_USE_GLX)
-    if (!m_defaultContextInfos.contains(screen))
-        return;
-    QOpenGLDefaultContextInfo* info = m_defaultContextInfos.take(screen);
-    delete info;
-#else
-    Q_UNUSED(screen);
-#endif
-}
-
 QT_END_NAMESPACE
diff --git a/src/plugins/platforms/xcb/qxcbintegration.h b/src/plugins/platforms/xcb/qxcbintegration.h
index 13b3b115ca..6db9d82cca 100644
--- a/src/plugins/platforms/xcb/qxcbintegration.h
+++ b/src/plugins/platforms/xcb/qxcbintegration.h
@@ -52,10 +52,6 @@ class QAbstractEventDispatcher;
 class QXcbNativeInterface;
 class QXcbScreen;
 
-#if !defined(QT_NO_OPENGL) && defined(XCB_USE_GLX)
-class QOpenGLDefaultContextInfo;
-#endif
-
 class QXcbIntegration : public QPlatformIntegration
 {
 public:
@@ -99,8 +95,6 @@ public:
     QStringList themeNames() const;
     QPlatformTheme *createPlatformTheme(const QString &name) const;
 
-    void removeDefaultOpenGLContextInfo(QXcbScreen *screen);
-
 private:
     QList<QXcbConnection *> m_connections;
 
@@ -110,10 +104,6 @@ private:
     QScopedPointer<QPlatformInputContext> m_inputContext;
     QAbstractEventDispatcher *m_eventDispatcher;
 
-#if !defined(QT_NO_OPENGL) && defined(XCB_USE_GLX)
-    mutable QHash<QXcbScreen *, QOpenGLDefaultContextInfo *> m_defaultContextInfos;
-#endif
-
 #ifndef QT_NO_ACCESSIBILITY
     QScopedPointer<QPlatformAccessibility> m_accessibility;
 #endif
diff --git a/src/plugins/platforms/xcb/qxcbwindow.cpp b/src/plugins/platforms/xcb/qxcbwindow.cpp
index c0ddf5c0ae..abd2f7a147 100644
--- a/src/plugins/platforms/xcb/qxcbwindow.cpp
+++ b/src/plugins/platforms/xcb/qxcbwindow.cpp
@@ -113,6 +113,10 @@
 #endif
 
 #define XCOORD_MAX 16383
+enum {
+    defaultWindowWidth = 160,
+    defaultWindowHeight = 160
+};
 
 //#ifdef NET_WM_STATE_DEBUG
 
@@ -219,8 +223,16 @@ void QXcbWindow::create()
     QRect rect = window()->geometry();
     QPlatformWindow::setGeometry(rect);
 
-    rect.setWidth(qBound(1, rect.width(), XCOORD_MAX));
-    rect.setHeight(qBound(1, rect.height(), XCOORD_MAX));
+    QSize minimumSize = window()->minimumSize();
+    if (rect.width() > 0 || rect.height() > 0) {
+        rect.setWidth(qBound(1, rect.width(), XCOORD_MAX));
+        rect.setHeight(qBound(1, rect.height(), XCOORD_MAX));
+    } else if (minimumSize.width() > 0 || minimumSize.height() > 0) {
+        rect.setSize(minimumSize);
+    } else {
+        rect.setWidth(defaultWindowWidth);
+        rect.setHeight(defaultWindowHeight);
+    }
 
     xcb_window_t xcb_parent_id = m_screen->root();
     if (parent())
@@ -436,15 +448,23 @@ void QXcbWindow::setGeometry(const QRect &rect)
     propagateSizeHints();
     const QRect wmGeometry = windowToWmGeometry(rect);
 
-    const quint32 mask = XCB_CONFIG_WINDOW_X | XCB_CONFIG_WINDOW_Y | XCB_CONFIG_WINDOW_WIDTH | XCB_CONFIG_WINDOW_HEIGHT;
-    const qint32 values[] = {
-        qBound<qint32>(-XCOORD_MAX, wmGeometry.x(),      XCOORD_MAX),
-        qBound<qint32>(-XCOORD_MAX, wmGeometry.y(),      XCOORD_MAX),
-        qBound<qint32>(1,           wmGeometry.width(),  XCOORD_MAX),
-        qBound<qint32>(1,           wmGeometry.height(), XCOORD_MAX),
-    };
-
-    Q_XCB_CALL(xcb_configure_window(xcb_connection(), m_window, mask, reinterpret_cast<const quint32*>(values)));
+    if (qt_window_private(window())->positionAutomatic) {
+        const quint32 mask = XCB_CONFIG_WINDOW_WIDTH | XCB_CONFIG_WINDOW_HEIGHT;
+        const qint32 values[] = {
+            qBound<qint32>(1,           wmGeometry.width(),  XCOORD_MAX),
+            qBound<qint32>(1,           wmGeometry.height(), XCOORD_MAX),
+        };
+        Q_XCB_CALL(xcb_configure_window(xcb_connection(), m_window, mask, reinterpret_cast<const quint32*>(values)));
+    } else {
+        const quint32 mask = XCB_CONFIG_WINDOW_X | XCB_CONFIG_WINDOW_Y | XCB_CONFIG_WINDOW_WIDTH | XCB_CONFIG_WINDOW_HEIGHT;
+        const qint32 values[] = {
+            qBound<qint32>(-XCOORD_MAX, wmGeometry.x(),      XCOORD_MAX),
+            qBound<qint32>(-XCOORD_MAX, wmGeometry.y(),      XCOORD_MAX),
+            qBound<qint32>(1,           wmGeometry.width(),  XCOORD_MAX),
+            qBound<qint32>(1,           wmGeometry.height(), XCOORD_MAX),
+        };
+        Q_XCB_CALL(xcb_configure_window(xcb_connection(), m_window, mask, reinterpret_cast<const quint32*>(values)));
+    }
 
     xcb_flush(xcb_connection());
 }
@@ -563,6 +583,7 @@ void QXcbWindow::show()
             if (!transientXcbParent)
                 transientXcbParent = static_cast<QXcbScreen *>(screen())->clientLeader();
             if (transientXcbParent) { // ICCCM 4.1.2.6
+                m_gravity = XCB_GRAVITY_CENTER;
                 Q_XCB_CALL(xcb_change_property(xcb_connection(), XCB_PROP_MODE_REPLACE, m_window,
                                                XCB_ATOM_WM_TRANSIENT_FOR, XCB_ATOM_WINDOW, 32,
                                                1, &transientXcbParent));
@@ -1221,8 +1242,10 @@ void QXcbWindow::propagateSizeHints()
 
     QWindow *win = window();
 
-    xcb_size_hints_set_position(&hints, true, rect.x(), rect.y());
-    xcb_size_hints_set_size(&hints, true, rect.width(), rect.height());
+    if (!qt_window_private(win)->positionAutomatic)
+        xcb_size_hints_set_position(&hints, true, rect.x(), rect.y());
+    if (rect.width() < QWINDOWSIZE_MAX || rect.height() < QWINDOWSIZE_MAX)
+        xcb_size_hints_set_size(&hints, true, rect.width(), rect.height());
     xcb_size_hints_set_win_gravity(&hints, m_gravity);
 
     QSize minimumSize = win->minimumSize();