Added code for erasing the small square between scrollbars.

Corrected window size if scrollbars is removed/added.
  Reduce flicker in scrollbars.
  Prevent scrollbars from jumping back to original position
    if the mouse just barely left the scrollbar.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@14872 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/x11/app.cpp

@@ -734,7 +734,7 @@ bool wxApp::ProcessXEvent(WXEvent* _event)
         {
             if (!win->IsEnabled())
                 return FALSE;
-
+                
             // Here we check if the top level window is
             // disabled, which is one aspect of modality.
             wxWindow *tlw = win;