Fix the blank areas during resize with the raster engine on Mac OS X.

This is mainly done by reverting the commit
04e34fe3aecca482abeeabe2e31778e9102eeb08

Task-number: QTBUG-11518
Reviewed-by: Samuel

3 files changed, 7 insertions, 18 deletions

diff --git a/src/gui/kernel/qcocoaview_mac.mm b/src/gui/kernel/qcocoaview_mac.mm
index 03b6b17..62b9f77 100644
--- a/src/gui/kernel/qcocoaview_mac.mm
+++ b/src/gui/kernel/qcocoaview_mac.mm
@@ -533,13 +533,11 @@ static int qCocoaViewCount = 0;
         return;
 
     if (QApplicationPrivate::graphicsSystem() != 0) {
-        if (qwidgetprivate->maybeBackingStore()) {
-            // Drawing is handled on the window level
-            // See qcocoasharedwindowmethods_mac_p.h
-            if (!qwidget->testAttribute(Qt::WA_PaintOnScreen))
-                return;
-        }
+        if (QWidgetBackingStore *bs = qwidgetprivate->maybeBackingStore())
+            bs->markDirty(qwidget->rect(), qwidget);
+        qwidgetprivate->syncBackingStore(qwidget->rect());
     }
+
     CGContextRef cg = (CGContextRef)[[NSGraphicsContext currentContext] graphicsPort];
     qwidgetprivate->hd = cg;
     CGContextSaveGState(cg);
diff --git a/src/gui/kernel/qwidget.cpp b/src/gui/kernel/qwidget.cpp
index bda0885..39b15a3 100644
--- a/src/gui/kernel/qwidget.cpp
+++ b/src/gui/kernel/qwidget.cpp
@@ -1858,13 +1858,7 @@ void QWidgetPrivate::syncBackingStore()
         repaint_sys(dirty);
         dirty = QRegion();
     } else if (QWidgetBackingStore *bs = maybeBackingStore()) {
-#ifdef QT_MAC_USE_COCOA
-        Q_UNUSED(bs);
-        void qt_mac_set_needs_display(QWidget *, QRegion);
-        qt_mac_set_needs_display(q_func(), QRegion());
-#else
         bs->sync();
-#endif
     }
 }
 
@@ -1873,13 +1867,7 @@ void QWidgetPrivate::syncBackingStore(const QRegion &region)
     if (paintOnScreen())
         repaint_sys(region);
     else if (QWidgetBackingStore *bs = maybeBackingStore()) {
-#ifdef QT_MAC_USE_COCOA
-        Q_UNUSED(bs);
-        void qt_mac_set_needs_display(QWidget *, QRegion);
-        qt_mac_set_needs_display(q_func(), region);
-#else
         bs->sync(q_func(), region);
-#endif
     }
 }
 
diff --git a/src/gui/painting/qwindowsurface_raster.cpp b/src/gui/painting/qwindowsurface_raster.cpp
index f271e56..37c671a 100644
--- a/src/gui/painting/qwindowsurface_raster.cpp
+++ b/src/gui/painting/qwindowsurface_raster.cpp
@@ -295,7 +295,10 @@ void QRasterWindowSurface::flush(QWidget *widget, const QRegion &rgn, const QPoi
     CGContextRestoreGState(context);
 #ifndef QT_MAC_USE_COCOA
     QDEndCGContext(port, &context);
+#else
+    CGContextFlush(context);
 #endif
+
 #endif // Q_WS_MAC
 
 #ifdef Q_OS_SYMBIAN