bug#20677: tooltips generate garbage

[Eli Zaretskii]

> Date: Mon, 01 Jun 2015 13:46:54 +0200
> From: Angelo Graziosi <angelo.graziosi@alice.it>
> CC: 20677@debbugs.gnu.org, jan.h.d@swipnet.se
> 
> OK. This master,
> 
> 
> http://git.savannah.gnu.org/cgit/emacs.git/snapshot/emacs-7ac84a2570e1268cc040fcd529508307b2b22c01.tar.gz
> 
> (http://git.savannah.gnu.org/cgit/emacs.git/commit/?id=7ac84a2570e1268cc040fcd529508307b2b22c01)
> 
> works as expected.
> 
> Instead the next,
> 
> 
> http://git.savannah.gnu.org/cgit/emacs.git/snapshot/emacs-ee14727ce033bae3bc11af35e7843604e5a5e635.tar.gz
> 
> (http://git.savannah.gnu.org/cgit/emacs.git/commit/?id=ee14727ce033bae3bc11af35e7843604e5a5e635)
> 
> shows the tooltip garbage I described.
> 
> For what I can see, the issue regards only the GTK build on GNU/Linux 
> (Linux Mint 17.1 64 bit, with GTK+ 3.10)

Looks like the Cairo merge caused this.  Jan, could you take a look,
please?

Thanks.