Fix redraw problems with hint rectangle when there is no transparency

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@40233 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/aui/framemanager.cpp

@@ -2540,6 +2540,11 @@ void wxFrameManager::ShowHint(const wxRect& rect)
             }
         }
 
+        // As we can only hide the hint by redrawing the managed window, we
+        // need to clip the region to the managed window too or we get
+        // nasty redrawn problems.
+        clip.Intersect(m_frame->GetRect());
+
         screendc.SetClippingRegion(clip);
 
         wxBitmap stipple = wxPaneCreateStippleBitmap();