[PATCH] xdpyinfo: Print Composite extension version for "-ext Composite"

[Alan Coopersmith]

Alan Coopersmith wrote:
> The only other information I could see to query in the Composite 0.4
> protocol spec is the Composite Overlay Window XID, but the request to
> get that ID has the side effect of mapping the overlay window, and
> xdpyinfo shouldn't have side effects like that.

I've gone ahead and pushed this patch since it works and doesn't break
anything, but I should have mentioned when sending it that I did so
mostly for comments on whether there was any information xdpyinfo
could print about Composite other than just the version number the
server supports.

When thinking about this, I thought that it might be interesting for
debugging if programs like xwininfo could query & print redirection
status for windows, and possibly pixmap ids for windows that have
had NameWindowPixmap called on them, but I don't see a way to query
those in the current protocol.

-- 
	-Alan Coopersmith-           alan.coopersmith at sun.com
	 Sun Microsystems, Inc. - X Window System Engineering