Fake configure event for XRandR emulation

[Alexander Zvegintsev]

Hi Olivier, everyone,

FYI:

I did a follow up testing after fixing !731 (merged) 
<https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/731> and 
noticed a few issues:

 1. There is no event when you are trying to change to native resolution
    from another.
 2. XRRScreenChangeNotifyEvent always has native resolution reported (We
    are not using it though, so it is just an observation)
 3. It might be a minor one, but on X11 session there is no events
    reported if you are trying to change to the same resolution.

Filed as xorg/xserver/-/issues/1305 
<https://gitlab.freedesktop.org/xorg/xserver/-/issues/1305>

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Thanks,
Alexander.