XCB plugin: query screen resources without _current

xcb_randr_get_screen_resources() and xcb_randr_get_screen_resources_current()
do basically the same, but for one case: if nothing has queried these
information ever before. So if an application is the very first client ever
to connect to an X server it may just return nothing. A call to
xcb_randr_get_screen_info_reply() will then cause the X server to allocate the
needed information and send an update notification, resulting in a second
QXcbScreen being created, but the other one is still around and probably used.

The behavior I observed with a simple test application was that the application
was not visible on the screen when it was the first client ever on the X
server. Killing the application and starting it again made it work just fine.

Change-Id: Id64f267e8ebcfa5b39d21d98307170a09e5169df
Reviewed-by: Uli Schlachter <psychon@znc.in>
Reviewed-by: Gatis Paeglis <gatis.paeglis@digia.com>
Reviewed-by: Shawn Rutledge <shawn.rutledge@digia.com>

0 files changed, 0 insertions, 0 deletions