Have wxPropertyGridEditorEventForwarder::ProcessEvent() return true more often - that is when the event was recognized as being 'handled', and specifically for the case of property editor's button being pressed (fixes #12487).

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@66240 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/propgrid/propgrid.h

@@ -1526,7 +1526,7 @@ public:
     void RefreshEditor();
 
     // Events from editor controls are forward to this function
-    void HandleCustomEditorEvent( wxEvent &event );
+    bool HandleCustomEditorEvent( wxEvent &event );
 
     // Mostly useful for page switching.
     void SwitchState( wxPropertyGridPageState* pNewState );