xcb: Use XShape for DnD when a compositing manager is not running

Otherwise transparent areas of the drag'n'drop pixmap are painted
with the black color.

Task-number: QTBUG-45193
Change-Id: I55b7c7caababe13584fa1c7a52835f112e20f920
Reviewed-by: Lars Knoll <lars.knoll@theqtcompany.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/gui/kernel/qshapedpixmapdndwindow_p.h b/src/gui/kernel/qshapedpixmapdndwindow_p.h
index 7536c09165..3d7974fa82 100644
--- a/src/gui/kernel/qshapedpixmapdndwindow_p.h
+++ b/src/gui/kernel/qshapedpixmapdndwindow_p.h
@@ -60,6 +60,7 @@ public:
 
     void render();
 
+    void setUseCompositing(bool on) { m_useCompositing = on; }
     void setPixmap(const QPixmap &pixmap);
     void setHotspot(const QPoint &hotspot);
 
@@ -72,6 +73,7 @@ private:
     QBackingStore *m_backingStore;
     QPixmap m_pixmap;
     QPoint m_hotSpot;
+    bool m_useCompositing;
 };
 
 QT_END_NAMESPACE