added GTKProcessEvent() to allow controlling whether we leave or not events for the native widgets

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@40953 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/window.h

@@ -166,6 +166,12 @@ public:
     // anything else. If it returns -1, the handler should continue as usual
     int GTKCallbackCommonPrologue(struct _GdkEventAny *event) const;
 
+    // override this if some events should never be consumed by wxWidgets but
+    // but have to be left for the native control
+    //
+    // base version just does GetEventHandler()->ProcessEvent()
+    virtual bool GTKProcessEvent(wxEvent& event) const;
+
 protected:
     // Override GTKWidgetNeedsMnemonic and return true if your
     // needs to set its mnemonic widget, such as for a