Bug#846779: xserver-xorg-core: chrome freezes with xorg-server 1.19.0

[Frédéric Brière <fbriere@fbriere.net>]

On Tue, Dec 13, 2016 at 05:08:15PM +0900, Michel Dänzer wrote:
> Did you not run into that while bisecting?
>
> [...]
> 
> Actually, that one wasn't a complete freeze, DRI2 clients would limp on
> as long as one would e.g. move the mouse. :) That may explain why you
> didn't notice it when bisecting.

For the record, there seems to be something within XFCE which keeps the
X server busy enough to prevent that bug from showing up.  After
launching a bare terminal without any WM, I was indeed able to reproduce
that behavior for f993091.

Mystery solved.  :)