Fix GL viewports under -graphicssystem raster.

GL widgets and native controls have paintonscreen set and bypasses
backingstore. They can thus not rely on the windowsurface flushing
but must be repainted via normal means

1 files changed, 3 insertions, 2 deletions

diff --git a/src/gui/kernel/qcocoaview_mac.mm b/src/gui/kernel/qcocoaview_mac.mm
index d5e7534..0714f73 100644
--- a/src/gui/kernel/qcocoaview_mac.mm
+++ b/src/gui/kernel/qcocoaview_mac.mm
@@ -461,8 +461,9 @@ extern "C" {
     if (QApplicationPrivate::graphicsSystem() != 0) {
         if (QWidgetBackingStore *bs = qwidgetprivate->maybeBackingStore()) {
             // Drawing is handled on the window level
-            // See qcocoasharedwindowmethods_mac_p.
-            return;
+            // See qcocoasharedwindowmethods_mac_p.h
+            if (!qwidget->testAttribute(Qt::WA_PaintOnScreen))
+                return;
         }
     }
     CGContextRef cg = (CGContextRef)[[NSGraphicsContext currentContext] graphicsPort];