When Retrieving touch delivery data we need to check if we have an active
grab on such device, and in that case use it to delivery events.
If we don't do this, when rejecting the touch events in DeactivatePointerGrab,
we will end-up in creating an implicit grab that will change the device
deviceGrab's state, causing a recursion during TouchEndTouch.
Fixes#7https://bugs.freedesktop.org/show_bug.cgi?id=96536
(cherry picked from commit 35e5a76cc1)
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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