bug#57434: 28.1.91; Terminal Emacs Mac OS flickering.

[Eli Zaretskii]

> Cc: 57434@debbugs.gnu.org
> Date: Sat, 27 Aug 2022 08:46:44 -0700
> From:  Dmitrii Kuragin via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> Here's a very interesting patch which fixes the flickering issue for me.
> 
> Maybe we do something inaccurate during the cost calculation? Or we use some 
> metric which is note
> representable on macos?

This has come up before, but we could never understand what's wrong
with that calculation.  Perhaps you could step in a debugger through
that code and tell what you see and why it flickers?