OK, another case where it is useful:

Video software that uses video overlays (ie, X Video), like VLC and
Totem, depend on some parts of the screen having an exact key color.
When the window is turned transparent, the color is changed, and the
video image disappears. (Depending on which key color the application
chooses, it might be replaced by a semi-transparent black, magenta or
green rectangle. With VLC I sometimes get even more weird results.) This
is not merely annoying as just the terminal changing transparency
levels; it actually looks broken.

This way of displaying video is actually very unfriendly for
Compiz—pretty much none of the effects work—it is unfortunately still
very often used and as far as I can tell almost unavoidable. So I still
think it'd be very useful to allow disabling this effect for some
windows.*   Many of the plugins offer this option, I don't see why it
wouldn't be allowed for this one; it's actually one of the simplest
plugins and only has a few options currently.

(* This might apply to the 'stretchy windows' plugin and some
transitions, too, I'm just not affected by those cases.)

-- 
Compiz should allow exceptions for window transparency
https://bugs.launchpad.net/bugs/162665
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