Besides the flicker, it also renders blank windows sometimes.

I will try the master. Thanks.

在 2020年2月16日 +0800 PM7:27，Alan Third <alan@idiocy.org>，写道：

On Sun, Feb 16, 2020 at 11:47:50AM +0800, HaiJun Zhang wrote:

Will this be fixed before emacs 27 released?
The whole frame flickers which makes me uncomfortable. Hope it will be fixed.

I’ve pushed a fix to the master branch, but unfortunately I don’t
think the fix will make it into Emacs 27. The fix has noticeably worse
performance than the current Emacs 27 branch, and even though I think
it will be fast enough, I can’t guarantee it for all situations. As a
result I’d rather the fix isn’t applied to Emacs 27 just in case we
end up doing a release that breaks people’s workflows. The current
bugs in Emacs 27 are annoying, but they can be easily worked around.
--
Alan Third