Updated the erase/paint event logic.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@14216 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/x11/toplevel.cpp

@@ -135,6 +135,10 @@ bool wxTopLevelWindowX11::Create(wxWindow *parent,
 
     wxAddWindowToTable( xwindow, (wxWindow*) this );
 
+    // Set background to None which will prevent X11 from clearing the
+    // background completely.
+    XSetWindowBackgroundPixmap( xdisplay, xwindow, None );
+
     // Messes up window management
     //    XSetTransientForHint( xdisplay, xwindow, xparent );