document the difference of event and event-after in GtkWidget

[Stefan Kost <kost imn htwk-leipzig de>]

hi hi,

it would be nice if someone could please document the event-after signal in
GtkWidget. Especially how it differs from "event".

I currently try to setup content menus on a GnomeCanvas, where the menus are
different for the canvas items and the canvas itself. I am not managing to test
the signal handlers for the items first and only if they do not handle the
signal, try the canvas handler (connected to "event-after").

Stefan
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