GNU bug report logs - #70000
29.2; Grapheme handling incorrect

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From: Phillip Susi <phill <at> thesusis.net>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 70000 <at> debbugs.gnu.org
Subject: bug#70000: 29.2; Grapheme handling incorrect
Date: Thu, 28 Mar 2024 12:16:33 -0400

Eli Zaretskii <eliz <at> gnu.org> writes:

> I understand.  But Emacs needs this information also long after the
> characters were already drawn.  For example, imagine that Emacs

Yes, it would have to learn the width the first time it displays each
grapheme and build a list of known widths to remember for future use.

> In addition, if Emacs had to query the cursor position after each
> written character, its redisplay would be much slower than it is now.

It would only need to query when printing a grapheme cluster, and only
the first time.  After that, it could remeber.

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