[Xcb] xcb-render-util crashs

[Julien Danjou]

Hi,

I've discovered that cairo crashes on X server not supporting RENDER.
(in this case, vnc4server).

In fact as soon as xcb-render-util sends a query version requests,
xcb_connection_t get erroneous, so everything crash then.

The affected code is in cache.c:find_or_create_display()

152     version_cookie = xcb_render_query_version(c, 0, 10); 
153     formats_cookie = xcb_render_query_pict_formats(c); 
154     xcb_flush(c); 

when xcb_render_util_query_version(c) is called.

I've no real clue how to correctly fix that, and I'd appreciate a hint.
I wonder if this is really normal[1] and if
xcb_render_util_query_version should simply chek for extension presence
before.

[1] Well I know I had the same problem in awesome with Xinerama, and I
do check for extension presence before asking for version.

Cheers,
-- 
Julien Danjou
// ᐰ <julien at danjou.info>   http://julien.danjou.info
// 9A0D 5FD9 EB42 22F6 8974  C95C A462 B51E C2FE E5CD
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