unpleasant flickering in terminal emacs

[Amos Bird <amosbird@gmail.com>]

Hi,

I'm using emacs master branch in terminal (alacritty). When moving
cursor with relative line number enabled or scrolling up/down, I 
get
unpleasant screen flickering. However, frame switch works fine, 
which
I suppose uses full rendering updates. It seems partial rendering
update doesn't work well. The author of alacritty mentioned one
possible cause : "flickering is typically caused by a program not
writing full updates to the pty. We drain all available bytes up 
to
like 64k before yielding for a render. It may be that we should 
add
some heuristic around time to prevent flickering from poorly 
behaved
terminal applications." So my question is, can I enable full 
updates
for every redisplay? Thanks!

Here is a screencast of flickering.

https://youtu.be/wv4QINKHDUY

regards,

--
Amos Bird
amosbird@gmail.com