#10 trigger all suitable event handlers instead of only one

[Michael Randel]

Is it possible to trigger all registered event handlers
(callback) instead of only one? At this time it seems
that only that event handler will be triggered which
matches choosen criteria first (see
gitk_dialog_process_event). So registering an event
handler could have possibly no affect. From users view
such a behaviour is surely questionable, I think.

[Stefan Sauer]

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The callbacks return TRUE or FALSE - TRUE if they handled
the event. I thiunk I need to try all callbacks until one
returns TRUE or I run out of callback-nodes.

Does this sound better?