flicker reduction for gtk2

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@33931 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

wxPython/wx/lib/mixins/listctrl.py

@@ -226,7 +226,10 @@ class ListCtrlAutoWidthMixin:
 
             We automatically resize the last column in the list.
         """
-        wx.CallAfter(self._doResize)
+        if 'gtk2' in wx.PlatformInfo:
+            self._doResize()
+        else:
+            wx.CallAfter(self._doResize)
         event.Skip()