gnome-shell-3.0.0.1 event handling freeze bug

[Owen Taylor <otaylor redhat com>]

Would like to roll a 3.0.0.1 tarball of GNOME Shell with the fix from:

 https://bugzilla.gnome.org/show_bug.cgi?id=646825

In it. I'm not sure how common it is actually going to be I think
Vincent hit it because he was specifically looking for bad things with
the new scrollbar code, and I didn't run into it with a weekend of
testing.

But if it does get hit it's pretty bad - power cycle your computer for
an average user - since all interactions with the shell UI are broken at
that point and it's impossible to log out.

I think I already have a +1 from vuntz:

<vuntz> owen: fyi, I consider this a blocker, since it can completely
block you out and it happened to me the very first time I used the
network indicator :-)
[..]
<vuntz> owen: that fixes the bug

So need another sign-off.

- Owen