Detecting whether a compositing manager is running

[Christian Neumair]

It can be useful for applications and desktop environments to detect
whether an application manager is running, for instance to decide
whether it should use the rgba visual. According to Matthias Clasen,
there are no means to detect this as of writing [1]. Maybe we should
have a per-Screen flag which returns whether a compositing manager is
running for that particular Screen.
Opinions?

[1]
http://mail.gnome.org/archives/gtk-app-devel-list/2005-September/msg00124.html

-- 
Christian Neumair <chris at gnome-de.org>
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