libxcb 14.1 and older are not forwards-compatible with new device
classes as it does not properly ignore unknown device classes. Since
breaking libxcb would break quite a lot of applications, we instead
report Gesture device class only if the client advertised support for XI
2.4.
Clients may still not work in cases when a client advertises XI 2.4
support and then a completely separate module within the client uses
broken libxcb to call XIQueryDevice.
Signed-off-by: Povilas Kanapickas <povilas@radix.lt>
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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