[PATCH] worker: flush ui buffers before running the worker

[Yuya Nishihara]

On Tue, 28 Mar 2017 10:22:18 -0700, David Soria Parra wrote:
> # HG changeset patch
> # User David Soria Parra <davidsp at fb.com>
> # Date 1490721698 25200
> #      Tue Mar 28 10:21:38 2017 -0700
> # Node ID b89199982355728a3741edf5518c72ccc52ee33c
> # Parent  331cc4433efe0d897bb16ad4ff08a3fbe850869b
> worker: flush ui buffers before running the worker

Queued, thanks.

This should mitigate the problem reported as
https://bz.mercurial-scm.org/show_bug.cgi?id=4929