Subject: bug#52067: 29.0.50; string-glyph-split halts on certain emoji strings

From: Paul Maragakis <[email-masked]>
Date: Wed, 24 Nov 2021 10:15:07 -0500

Excellent---and thanks for the explanation!  
I confirm that the latest Emacs 29 fixes the bug.  
You can close this ticket.

Paul

> On Nov 24, 2021, at 2:30 AM, Lars Ingebrigtsen <[email-masked]> wrote:
> 
> Paul Maragakis <[email-masked]> writes:
> 
>> The logic in string-glyph-split expects the first two elements in the result
>> from find-composition-internal to give the start and end of a multibyte grapheme
>> and return nil when there is a regular character at position POS.  However, this 
>> isn't always the case.
> 
> Yup.  
> 
> Paul Maragakis <[email-masked]> writes:
> 
>> The following code fixes this bug, though there might be better ways
>> to fix it for someone who understands the domain.
> 
> Thanks.  `find-composition' takes a the LIMIT parameter, and that'll
> make it avoid searching back into the bit of the string that we've
> already handled.  So I did that instead in Emacs 29.
> 
> -- 
> (domestic pets only, the antidote for overdose, milk.)
>   bloggy blog: http://lars.ingebrigtsen.no