Win QPA: Pass in the top level setting instead of relying on isTopLevel()

When updateDropSite() is called then most of the time calling
window()->isTopLevel() is enough. But in a case like while the window is
being reparented it cannot be trusted. So we pass it as a variable so that
it is possible to give it the correct information when it is being called.

Task-number: QTBUG-39739
Change-Id: I77a7ceeaf78e89b1f65a10d60df86088b35e0fe5
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@theqtcompany.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/plugins/platforms/windows/qwindowswindow.h b/src/plugins/platforms/windows/qwindowswindow.h
index 6d6d473ccd..0b42e77ecd 100644
--- a/src/plugins/platforms/windows/qwindowswindow.h
+++ b/src/plugins/platforms/windows/qwindowswindow.h
@@ -274,7 +274,7 @@ private:
     void destroyWindow();
     inline bool isDropSiteEnabled() const { return m_dropTarget != 0; }
     void setDropSiteEnabled(bool enabled);
-    void updateDropSite();
+    void updateDropSite(bool topLevel);
     void handleGeometryChange();
     void handleWindowStateChange(Qt::WindowState state);
     inline void destroyIcon();