more fixes to keypress handling in wxGTK:

1. don't eat unprocessed events originating from child widgets
2. tell IM context about focus changes
3. set wxKeyEvent modifiers information from last GdkEventKey leading to IM's commit signal


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@28033 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/defs.h

@@ -2367,11 +2367,6 @@ typedef GtkWidget *WXWidget;
 #define GTK_CLASS_TYPE(klass) ((klass)->type)
 #endif
 
-#ifdef __WXGTK20__
-/* Input method thing */
-typedef struct _GtkIMContext       GtkIMContext;
-#endif /*  __WXGTK20__ */
-
 #endif /*  __WXGTK__ */
 
 #if defined(__WXGTK20__) || (defined(__WXX11__) && wxUSE_UNICODE)