There is a race when reseting the XServer that causes spriteInfo to be
NULL in GetPairedDevice resulting a segfault and subsequent crash. The
problem was noticed when opening a connection, creating master devices,
destroying master devices and closing the connection during testing.
Signed-off-by: Arthur Williams <taaparthur@gmail.com>
The X server accepts requests from client applications to create windows,
which are (normally rectangular) "virtual screens" that the client program
can draw into.
Windows are then composed on the actual screen by the X server
(or by a separate composite manager) as directed by the window manager,
which usually communicates with the user via graphical controls such as buttons
and draggable titlebars and borders.
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