5 files changed, 17 insertions, 11 deletions
diff --git a/src/gui/kernel/qapplication_win.cpp b/src/gui/kernel/qapplication_win.cpp
index 0a03397251..72a05afbd0 100644
--- a/src/gui/kernel/qapplication_win.cpp
+++ b/src/gui/kernel/qapplication_win.cpp
@@ -237,6 +237,7 @@ static void resolveAygLibs()
 #  define FE_FONTSMOOTHINGCLEARTYPE 0x0002
 #endif
 
+Q_GUI_EXPORT qreal qt_fontsmoothing_gamma;
 Q_GUI_EXPORT bool qt_cleartype_enabled;
 Q_GUI_EXPORT bool qt_win_owndc_required; // CS_OWNDC is required if we use the GL graphicssystem as default
 
@@ -653,8 +654,18 @@ static void qt_win_read_cleartype_settings()
     if (SystemParametersInfo(SPI_GETFONTSMOOTHINGTYPE, 0, &result, 0))
         qt_cleartype_enabled = (result == FE_FONTSMOOTHINGCLEARTYPE);
 #endif
-}
 
+    int winSmooth;
+    if (SystemParametersInfo(0x200C /* SPI_GETFONTSMOOTHINGCONTRAST */, 0, &winSmooth, 0)) {
+        qt_fontsmoothing_gamma = winSmooth / qreal(1000.0);
+    } else {
+        qt_fontsmoothing_gamma = 1.0;
+    }
+
+    // Safeguard ourselves against corrupt registry values...
+    if (qt_fontsmoothing_gamma > 5 || qt_fontsmoothing_gamma < 1)
+        qt_fontsmoothing_gamma = qreal(1.4);
+}
 
 static void qt_set_windows_resources()
 {
diff --git a/src/gui/kernel/qcocoaview_mac.mm b/src/gui/kernel/qcocoaview_mac.mm
index b5e5d186b8..e885d1552c 100644
--- a/src/gui/kernel/qcocoaview_mac.mm
+++ b/src/gui/kernel/qcocoaview_mac.mm
@@ -334,7 +334,6 @@ static int qCocoaViewCount = 0;
         //
         // Qt will then forward the update to the children.
         if (qwidget->isWindow()) {
-            qwidget->update(qwidget->rect());
             qwidgetprivate->syncBackingStore(qwidget->rect());
         }
     }
diff --git a/src/gui/kernel/qdesktopwidget_qpa.cpp b/src/gui/kernel/qdesktopwidget_qpa.cpp
index b79e4e1618..7b175dbe95 100644
--- a/src/gui/kernel/qdesktopwidget_qpa.cpp
+++ b/src/gui/kernel/qdesktopwidget_qpa.cpp
@@ -50,6 +50,7 @@ QT_USE_NAMESPACE
 
 void QDesktopWidgetPrivate::updateScreenList()
 {
+    Q_Q(QDesktopWidget);
     QList<QPlatformScreen *> screenList = QGuiApplicationPrivate::platformIntegration()->screens();
     int targetLength = screenList.length();
     int currentLength = screens.length();
@@ -71,19 +72,15 @@ void QDesktopWidgetPrivate::updateScreenList()
     }
 
     QRegion virtualGeometry;
-    bool doVirtualGeometry = QGuiApplicationPrivate::platformIntegration()->isVirtualDesktop();
 
     // update the geometry of each screen widget
     for (int i = 0; i < screens.length(); i++) {
         QRect screenGeometry = screenList.at(i)->geometry();
         screens.at(i)->setGeometry(screenGeometry);
-        if (doVirtualGeometry)
-            virtualGeometry += screenGeometry;
+        virtualGeometry += screenGeometry;
     }
 
-    virtualScreen.setGeometry(virtualGeometry.boundingRect());
-    Q_Q(QDesktopWidget);
-    q->setGeometry(virtualScreen.geometry());
+    q->setGeometry(virtualGeometry.boundingRect());
 }
 
 QDesktopWidget::QDesktopWidget()
@@ -117,8 +114,6 @@ int QDesktopWidget::numScreens() const
 QWidget *QDesktopWidget::screen(int screen)
 {
     Q_D(QDesktopWidget);
-    if (QGuiApplicationPrivate::platformIntegration()->isVirtualDesktop())
-        return &d->virtualScreen;
     if (screen < 0 || screen >= d->screens.length())
         return d->screens.at(0);
     return d->screens.at(screen);
diff --git a/src/gui/kernel/qdesktopwidget_qpa_p.h b/src/gui/kernel/qdesktopwidget_qpa_p.h
index abee8a101e..d6ed686a3f 100644
--- a/src/gui/kernel/qdesktopwidget_qpa_p.h
+++ b/src/gui/kernel/qdesktopwidget_qpa_p.h
@@ -76,7 +76,6 @@ public:
     void updateScreenList();
 
     QList<QDesktopScreenWidget *> screens;
-    QDesktopScreenWidget virtualScreen;
 };
 
 #endif // QDESKTOPWIDGET_QPA_P_H
diff --git a/src/gui/kernel/qsessionmanager_qpa.cpp b/src/gui/kernel/qsessionmanager_qpa.cpp
index bd6fc62f31..0730204720 100644
--- a/src/gui/kernel/qsessionmanager_qpa.cpp
+++ b/src/gui/kernel/qsessionmanager_qpa.cpp
@@ -43,6 +43,8 @@
 #include <qapplication.h>
 
 #include <private/qobject_p.h>
+#include <qapplication.h>
+
 #ifndef QT_NO_SESSIONMANAGER
 
 QT_BEGIN_NAMESPACE