GNU bug report logs - #54488
29.0.50; move-to-column/overlay-related regression in latest master, perhaps 28?

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From: João Távora <joaotavora <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 54488 <at> debbugs.gnu.org, dgutov <at> yandex.ru
Subject: bug#54488: 29.0.50; move-to-column/overlay-related regression in latest master, perhaps 28?
Date: Thu, 24 Mar 2022 16:03:59 +0000

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

>> An interesting one, though.  I think I follow.  Is there some easy way
>> in Emacs to measure how many UTF-16 code units a given codepoint takes?
>
> That's easy: any codepoint above #xFFFF needs 2 UTF-16 code units.

>> I'm afraid I evicted this knowledge from the cache since I made that fix
>> 2,5 years ago... Is a "codepoint" here a character in a string/buffer?
>
> Yes.

Indeed seems easy enough :-).  So

(defun measure (s) (cl-loop for c across s sum (if (> c #xFFFF) 2 1)))

?

João

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