Action menu: ensure a wxEVT_COMMAND_MENU_SELECTED event is sent to the menu,

when a wxTextCtrl has the focus but is read only, and cannot use a CHAR event.
It fixes an issue in Kicad manager (menus with accelerator not working) when
the wxTextCtrl window showing messages has the focus.

common/tool/action_menu.cpp

@@ -415,7 +415,12 @@ void ACTION_MENU::OnMenuEvent( wxMenuEvent& aEvent )
                     focus->HandleWindowEvent( keyEvent );
                 }
 
-                return;
+                // If the event was used as KEY event (not skipped) by the focused window,
+                // just finish.
+                // Otherwise this is actually a wxEVT_COMMAND_MENU_SELECTED, or the
+                // focused window is read only
+                if( !keyEvent.GetSkipped() )
+                    return;
             }
         }