Subject: Re: bug#41200: Displaying a tooltip with x-show-tip gets very slow as more faces are defined

From: Eli Zaretskii <[email-masked]>
Date: Fri, 15 May 2020 17:34:22 +0300

> From: Stefan Monnier <[email-masked]>
> Cc: Eli Zaretskii <[email-masked]>, [email-masked]
> Date: Fri, 15 May 2020 10:03:44 -0400
> 
> I'm hoping it can make it into Emacs-27.1, tho it is probably rather
> late for such a significant change.

It's too late.  Such a significant change on such a low level is got
to cause some issues, especially as parts of it are
backward-incompatible.