bug#38727: 27.0.50; The frame refreshes when pressing 'C-h k'

[HaiJun Zhang]

The missing attachment.

在 2019年12月30日 +0800 PM9:29，HaiJun Zhang <netjune@outlook.com>，写道：

在 2019年12月30日 +0800 PM7:27，Alan Third <alan@idiocy.org>，写道：

Hi, I can’t replicate this. I suspect it’s something in your config
slowing redisplay enough for bug#32932 to appear.

It is 100% reproducible on my machine with or without my config. The machine is macbook pro 2016. The OS is macOS 10.13.6.

There is a record video in the attachment.

Can you try the branch scratch/ns/draw-to-bitmap and see if the same
issue occurs there?

I can’t reproduce the problem with this branch.

emacs_flicker.mp4
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