[PATCH] Don't alter device button maps in DoSetPointerMapping

[Thomas Jaeger]

I think the current behavior violates the core spec: If, say, button 1
is pressed on a device where it is currently disabled, but it is mapped
to itself on the VCP, then an XSetPointerMapping request that doesn't
change the mapping of button 1 will nonetheless fail.

Thomas Jaeger wrote:
> The wrong checks are being performed which can lead to XInput grabs
> failing to work.  I'd argue, though, that remapping device buttons is
> wrong anyway, see my next email.

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