someone forgot to clear the m_needUpdating flag, so Splitter-Windows were always redrawn after the first sash move in the OnIdle function, even after the dragging was over\!

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@6642 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/splitter.cpp

@@ -266,6 +266,7 @@ void wxSplitterWindow::OnMouseEvent(wxMouseEvent& event)
         }
 
         SizeWindows();
+        m_needUpdating = FALSE;
     }  // left up && dragging
     else if (event.Moving() && !event.Dragging())
     {