Implemented OnParentEnable to allow widgets to reset their colours

after a wxWindow::Enable call


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@10193 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/window.h

@@ -114,6 +114,11 @@ public:
     /* For compatibility across platforms (not in event table) */
     void OnIdle(wxIdleEvent& WXUNUSED(event)) {};
 
+    // wxGTK-specific: called recursively by Enable,
+    // to give widgets an oppprtunity to correct their colours after they
+    // have been changed by Enable
+    virtual void OnParentEnable( bool WXUNUSED(enable) ) {};
+
     /* used by all window classes in the widget creation process */
     bool PreCreation( wxWindow *parent, const wxPoint &pos, const wxSize &size );
     void PostCreation();