Compiz Integration

[dragoran]

With fc6 compiz and AIGLX got into fedora and we should improve the user 
expirence with this in F7, not make it worse.
We also need to integrate compiz better into our desktop.

Right now its easy to active and to disable with the "Desktop Effects" app.
But this does not work correctly due to some regressions.

1)Compiz gets started from the session manager and so its not possible 
to switch compiz->metacity because compiz restarts itself.
2)The next thing is that if compiz is configured to use 4 Viewports and 
Metacity 4 Workspaces compiz will ignore its own setting and use the 
metacity one until X is restarted.

The god news are that this stuff is fixed, we only need to get the fixes 
into fedora ;)
There is a patch for 1) in bugzilla: 
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=229113
As for 2) I have sent a patch upstream which is merged into current git. 
It adds a --ignore-desktop-hints commandline switch to compiz which 
fixes this behavior. We need to either make it the default by patching 
compiz or start compiz with this option from "Desktop Effects". ( I can 
send a patch for desktop-effects/compiz if needed)

After doing this the switching between metacity and compiz should work 
as fine as it did when fc6 got released. (The current f6 updates have 
the same problems). I am using a custom compiz package(git snapshot) 
with this changes and it works without any problems and is stable. (With 
compiz-0.3.6 the window decorator sometimes crashes but this is fixed in 
git; have not seen any crash with it). We have shipped a git snapshot in 
fc6 so this should not be the problem, also 0.4 should be out sometime soon.

The next thing is libwnck. Compiz supports the "Always on top" feature 
but it is not selectable in the menu because of a bug in libwnck. There 
is a patch for it in the gnome bugzilla: 
http://bugzilla.gnome.org/show_bug.cgi?id=352383
The patch in question is the _NET_WM_STATE_ABOVE.patch we should get 
this into our libwnck package. We already have patches in libwnck and 
gnome-panel for compiz integration so it would not hurt to add this 
small patch too.
There is also the viewport.patch in this bugzilla entry. I am not using 
this myself right now (so I can't comment on its stability) but we also 
should aim to get this patch in too.

P.S: please don't start a compiz <> beryl flamewar