disable auto validation on toolbar items. fix #602
disable auto validation on toolbar items. fix #602

when auto validate is enabled and user clicks somewhere that doesn't
capture click event, the CPWindowDidChangeFirstResponderNotification
causes toolbars to be revalidated and enabled again, which is not what
we want.

ArchipelProject/Archipel,fr34k8/Archipel,ruthger/Archipel,rmoorman/Archipel,CyrilPeponnet/Archipel,rmoorman/Archipel,rmoorman/Archipel,ruthger/Archipel,fr34k8/Archipel,ArchipelProject/Archipel,fr34k8/Archipel,ruthger/Archipel,rmoorman/Archipel,ruthger/Archipel,CyrilPeponnet/Archipel,ArchipelProject/Archipel,rmoorman/Archipel,ArchipelProject/Archipel,ruthger/Archipel,CyrilPeponnet/Archipel,fr34k8/Archipel,ArchipelProject/Archipel,fr34k8/Archipel,CyrilPeponnet/Archipel,CyrilPeponnet/Archipel