autoscrolling via leave_notify

[Paul Davis <pbd op net>]

i want to get a scrolled window to scroll when i drag off its edges. i
can do that pretty easily when i just move the mouse off the sides of
the window by catching leave_notify events.

however, if there was a button press event, and i performed a grab on
pointer motion/button release events (very common in my case), then my
widget doesn't receive leave events for the window until the grab
finishes. this is, uhm, unfortunate.

any clues on how to make this work? i have a feeling that the CList
might do this, so i'll check its code, but any other ideas are more
than welcome.

--p