Have you read the thread from:
http://mail.gnome.org/archives/gtk-devel-list/2004-October/msg00099.html
? I'm not sure we came up with a decent design there, but there are several concrete proposals.
To answer the question to be posted in advance: ;-)
No I did not invest any time into that topic besides studying the current design and thinking about improvements (which I mostly posted to the list). Of course I'm still interested in a solution (even if I did not design/code it myself ;-) )
Back to my current remote_cvs<->monotone sync project Christof
PS: To summarize from memory: My idea was to design it hierarchically: Once you are about to display a tooltip traverse the widget tree (at given mouse position) and display the bottommost tooltip available. (E.g. a container is asked for a tooltip at position x,y: ask the child at that position for a tooltip (recursively via a callback (so that each widget has a chance of returning a different tooltip based on relative mouse position)), if nothing comes back use the containers tooltip).
IIRC groups (design proposed by Owen) mostly serve to display a tooltip upon different "related" widgets (e.g. adiacent buttons in a toolbar) without delay.
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