[compiz] Compiz session management

[Kristian Høgsberg]

On 3/28/07, dragoran <drago01 at gmail.com> wrote:
> Hello,
> After trying to solve a issue with desktop-effects in fedora (compiz
> does not let itself to be replaced by metacity).
> We come to the conclusion that the compiz session management code is broken.
> When unmanaging the screen compiz should unregister itself from the
> session manager to let a new started wm to take over the screen.
> See https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=229113

It looks like we're just missing closeSession() when we exit due to a
lost selection.  The attached patch should fix that as well as a
similar issue with SIGHUP. I'm not a session management expert though.

cheers,
Kristian
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