Bug#716959: More info

[Roderich Schupp]

The easisest way to reproduce the problem is:
- run gt3-demo (from package gtk-3-examples, any version >= 3.8 will do,
checked with 3.8.4 and 3.10.2)
- bring up example Text Widget/Multiple Views
- using a mouse with scrollwheel, turn the scrollwheel in one of its text
windows
- no scrolling occurs

(For fun, try holding down the left mouse button while using the
scrollwheel: scolling works; this is probably related to the workaround
"turn off Two Finger Scrolling".)

If you try the above under GDK_DEBUG=eventsyou can see that using the
scrollwheel results in a SCROLL_SMOOTH event, but with zero deltas.

See also https://bugs.launchpad.net/compiz/+bug/1200829
At first this seems unrelated (compiz: WTF?), but gets down to the real
culprit at the end.
I can confirm that Chris Townsend's fix  at
https://launchpadlibrarian.net/153419670/gtk%2B3.0_3.8.4-0ubuntu3_3.8.4-0ubuntu3test1.diff.gz
works for me in the above scenario, also for affected applications like
gedit and gnote.

Cheers, Roderich
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