[PATCH xserver] FlushAllOutput: Only call FlushCallbacks when actually flushing data

[Keith Packard]

Keith Packard <keithp at keithp.com> writes:

> It should, however, be sufficient to simply move the callback in
> FlushAllOutput after the check for 'newoutput'; newoutput should only
> ever be set if there is output to deliver.

It'd also be awesome to get the epoll patches merged to test the effect
of this in that context. There's a single patch in that list which
hasn't been reviewed...

-- 
-keith
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