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Sorry if that's a dumb question.

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Unity with Compiz will use the Compiz GTK window decorator, but it should be possible to replace that manually with Emerald if desired.

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Emerald is no longer being actively maintained, and a replacement is being worked on. However, ubuntu has always used GTK-Window decorator as Alex said, so no.

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Also, using another window decorator would mean that there have to be made 2 identically looking themes, one for Emerald (or its replacement) and one that's metacity-compatible for those who can't use Compiz. – JanC Oct 31 '10 at 22:31
good point <extra chars thing is annoying <-- typed to allow comment to post lol>. – RolandiXor Oct 31 '10 at 22:36
that's done for clever comments (like mine :-P) – Extender Nov 1 '10 at 6:08

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