Hmm.. I am afraid you will need to do it that old fashioned way. Detect a focus change event, then check with your recorded X,Y, if the same, it is a window move start and on the next focus change event, that is the window move end...
I tried signal_connect to all these other events: http://gtk2-perl.sourceforge.net/doc/gtk2-perl-tut/sec-Events.html They do not give anything for window...

In reply to Re^3: Gtk2 window dragging by FreeBeerReekingMonk
in thread Gtk2 window dragging by Anonymous Monk

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