From 5ad594a061f5494295b8e4cde73d4e5a7da7491d Mon Sep 17 00:00:00 2001
From: Gabriel de Dietrich <gabriel.dedietrich@digia.com>
Date: Tue, 1 Apr 2014 18:15:18 +0200
Subject: [PATCH] QMacNativeWidget: Fix background rendering
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The widget's background is transparent, but Qt is not owning the
backing store in this case, so we must make sure it gets properly
cleared and flushed.

Task-number: QTBUG-19840
Change-Id: I1087ce80aae3620d64a8c180129d79b5b022750b
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@digia.com>
Reviewed-by: Morten Johan Sørvig <morten.sorvig@digia.com>
---
 src/widgets/widgets/qmacnativewidget_mac.mm | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/widgets/widgets/qmacnativewidget_mac.mm b/src/widgets/widgets/qmacnativewidget_mac.mm
index 66a1ed7ce7..d3f3515b04 100644
--- a/src/widgets/widgets/qmacnativewidget_mac.mm
+++ b/src/widgets/widgets/qmacnativewidget_mac.mm
@@ -128,6 +128,7 @@ QMacNativeWidget::QMacNativeWidget(NSView *parentView)
     setAttribute(Qt::WA_SetPalette, false);
     setAttribute(Qt::WA_LayoutUsesWidgetRect);
     setAttribute(Qt::WA_TranslucentBackground);
+    setAttribute(Qt::WA_NoSystemBackground, false);
 }
 
 /*!