bug#56789: 28.1.90; Emoji composition problems with Harfbuzz 5.0.1-1

[Robert Pluim]

>>>>> On Wed, 27 Jul 2022 14:52:45 +0200, Robert Pluim <rpluim@gmail.com> said:

>>>>> On Wed, 27 Jul 2022 12:06:43 +0000, Simon Pugnet <simon@polaris64.net> 
>>>>> said:
    Simon> Hi Eli,
    Simon> "Eli Zaretskii" <eliz@gnu.org> writes:

    >>>> Date: Wed, 27 Jul 2022 06:10:06 +0000
    >>>> From: Simon Pugnet <simon@polaris64.net>
    >>>> 
    >>>> Instead of seeing a correctly composed emoji sequence as before, I
    >>>> now
    >>>> only see an empty box with a single-pixel border.
    >>> 
    >>> Could you show a screenshot of that "empty box"?


    >>> Also, does this happen in "emacs -Q"?

    Simon> Yes, my screenshot and tests were done with "emacs -Q".

    Robert> I can reproduce this on archlinux. If I downgrade to harfbuzz 
4.4.1-1
    Robert> the composed sequence displays properly , so it seems like a 
harfbuzz issue
    Robert> (or the way weʼre supposed to use the API has changed). In any case 
I
    Robert> think this needs to be taken up with the harfbuzz developers.

OK, known issue in harfbuzz, will be fixed in their next release:

<https://github.com/harfbuzz/harfbuzz/issues/3754>
<https://github.com/harfbuzz/harfbuzz/issues/3755>

Robert
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