[glade--]wrong declaration for visibility_notify_event

I created a program with glade-2 that has
Drawing area widget in it. The widget resides in it's
own class and file. I added a signal handler for
visibility_notify_event. The declaration in the
_glade.hh header file generated is

virtual void
on_mainview_visibility_notify_event() = 0;

while it should be

virtual bool
on_mainview_visibility_notify_event(GdkEventVisibility* ev) = 0;

Philipp Klasu Krause