Change the flushing of the CGContext to a synchronization.

When many NSView are being drawn, calling CGContextFlush()
is too expensive and some flickering becomes apparent.
We now call CGContextSynchronize() instead.

Since this solves the flickering problem, we can now
call setNeedsDisplay: for items in the unified
toolbar. This allows us to smootly trigger many
flushings inside the unified toolbar.

Task-number: QTBUG-19267
Reviewed-by: Jiang Jiang

1 files changed, 1 insertions, 1 deletions

diff --git a/src/gui/kernel/qcocoaview_mac.mm b/src/gui/kernel/qcocoaview_mac.mm
index b5e5d18..578970c 100644
--- a/src/gui/kernel/qcocoaview_mac.mm
+++ b/src/gui/kernel/qcocoaview_mac.mm
@@ -320,7 +320,7 @@ static int qCocoaViewCount = 0;
 
             }
 
-            CGContextFlush(context);
+            CGContextSynchronize(context);
             qt_mac_release_graphics_context(context);
             return;
         }