Thank you for digging deeper into this! There is a lot of useful information. But,

Here's a video of flickering https://youtu.be/Is2ebMXjhxg:

- Different MacBook (2019 I believe).

- Terminal.app (The one which comes as a standard).

- Simplest Emacs from http://emacsformacosx.com/

- No tmux.

- No advanced user customizations (it is not my laptop).

- Only display-line-numbers-mode is enabled with 'visual type.

It is definitely not attached to Alacritty, but probably the same issue with refresh vs frame rate updates.

On Thu, Sep 1, 2022 at 4:30 AM Eli Zaretskii <eliz@gnu.org> wrote:

> From: Gerd Möllmann <gerd.moellmann@gmail.com>
> Cc: kuragin@google.com, 57434@debbugs.gnu.org
> Date: Thu, 01 Sep 2022 10:56:35 +0200
>
> Eli Zaretskii <eliz@gnu.org> writes:
>
> > I'm not sure I understand: what would the user send to the terminal in
> > those hooks?
>
> They would send the begin-update/end-update control sequences. That
> would be ESC P <something> in the one proposal I mentioned.
>
> It would of course be better if we could do that automatically.

Exactly. I don't think it's reasonable to expect users to figure out
what and when to send if we cannot figure that out ourselves.

*If you get an email from me outside of the 9-5 it is not because I'm always on or expect an immediate response from you; it is because of work flexibility. Evening and weekend emails are a sign I allocated some regular working hours for other things (such as family, gym, friends,...). And I encourage you to feel free to do the same.