Created attachment 230362 [details]
Screenshot after ending swipe scroll

Did you update Clutter? There were some patches that landed in there.

Yes, but using the 3.8 moduleset. So those patches should probably land on the clutter-1.12 branch as well (unless the moduleset is switched to master)

I think it makes sense for gnome-shell master to track Clutter master, but let's ask Emmanuele in the morning.

For what it's worth, I'm still seeing this problem (and we started to track Clutter master a while ago)

You need to be using clutter-1.14, actually, because clutter master is dead.

http://git.gnome.org/browse/clutter/commit/?id=75b521de6e3294bb612f08b1f191b0f75778d828

This commit fixes the issues I saw with swipe scrolling, but there could be another bug somewhere. Add logging to the pan-stopped signal handler?

Created attachment 236918 [details] [review]
workspacesView: Treat 'gesture-cancel' the same as 'gesture-end'

When a swipe scroll completes, we scroll the active workspace into
view. This works fine if the gesture is completed properly by
emitting 'gesture-end', but not when Clutter considers the gesture
cancelled - in that case, the view remains stuck in an intermediate
position. To fix, treat 'gesture-cancel' the same as 'gesture-end'.

Review of attachment 236918 [details] [review]:

Aha. Nice catch.

Attachment 236918 [details] pushed as 420f010 - workspacesView: Treat 'gesture-cancel' the same as 'gesture-end'