[PATCH] composite: only update window contents when using automatic redirection

[Adam Jackson]

On Tue, 2010-09-07 at 14:43 -0700, Keith Packard wrote:
> On Tue, 7 Sep 2010 12:48:32 -0700, Jesse Barnes <jbarnes at virtuousgeek.org> wrote:
> 
> > Brian pointed this out awhile back but the fix was never merged.  So
> > here's a real patch.  Would be nice to get into 1.9.x as well if it
> > proves ok in master.
> 
> Looks like there are additional optimizations available here -- we're
> doing a full tree traversal per block handler whenever anything is
> damaged. Can the 'damage' boolean in both screen and window be
> restricted to Automatic update mode?

cs->damaged would need to be set for any automatic updates on the
screen, but otherwise I think the answer is yes.

Is there a reason why compWindowUpdate isn't a call to TraverseTree?  I
always feel nervous when I see manual tree walks, particularly when
TraverseTree tries so hard to not be recursive.

- ajax
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