QQuickWidget move/resize fix

Make sure the alphamask in the backingstore is updated whenever the
geometry of a QQuickWidget/QOpenGLWidget child changes.

Task-number: QTBUG-37372
Change-Id: I70e94664bd7da774694645f604e1a7277fe563c7
Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>
Reviewed-by: Ulf Hermann <ulf.hermann@digia.com>

1 files changed, 7 insertions, 2 deletions

diff --git a/src/widgets/kernel/qwidget_qpa.cpp b/src/widgets/kernel/qwidget_qpa.cpp
index 5885673591..3f0b0936c3 100644
--- a/src/widgets/kernel/qwidget_qpa.cpp
+++ b/src/widgets/kernel/qwidget_qpa.cpp
@@ -762,10 +762,15 @@ void QWidgetPrivate::setGeometry_sys(int x, int y, int w, int h, bool isMove)
             }
 
             if (!q->isWindow()) {
-                if (isMove && !isResize)
+                if (renderToTexture) {
+                    QRegion updateRegion(q->geometry());
+                    updateRegion += QRect(oldPos, olds);
+                    q->parentWidget()->d_func()->invalidateBuffer(updateRegion);
+                } else if (isMove && !isResize) {
                     moveRect(QRect(oldPos, olds), x - oldPos.x(), y - oldPos.y());
-                else
+                } else {
                     invalidateBuffer_resizeHelper(oldPos, olds);
+                }
             }
         }