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Implement proper handling of the _NET_CM_Sn selection #320

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Implement proper handling of the _NET_CM_Sn selection #320

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Commits on Oct 24, 2015

  1. Don't steal the _NET_WM_CM_Sn selection (chjj#301) 

    Before becoming the selection owner for _NET_WM_CM_Sn, compton will now check if
that selection is already owned (which means that another composite manager is
already running). If this check fails, startup will be refused. This behaviour
is required by EWMH / ICCCM.

Because this should catch all composite managers, the error message that was
used before when another manager is already running is reworded to mention that
the other manager does not follow EWMH.

Signed-off-by: Uli Schlachter <psychon@znc.in>
    @psychon
    psychon committed Oct 24, 2015
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  2. Exit when compton loses the _NET_WM_CM_Sn selection 

    Again, this behaviour is required by ICCCM.

Signed-off-by: Uli Schlachter <psychon@znc.in>
    @psychon
    psychon committed Oct 24, 2015
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