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

[Adam Jackson]

On Fri, 2016-07-08 at 16:37 +0200, Keith Packard wrote:
> 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...

Still not cool with committing code that we _know_ will break a
supported platform.

- ajax