bug#64652: 28.2; Adding a property bug on Windows 11

[Ihor Radchenko <yantar92@posteo.net>]

Ihor Radchenko <yantar92@posteo.net> writes:

>> Yes (except that Isearch has some heuristics regarding letter-case
>> when invoked interactively).  After set-language-environment to
>> Turkish, type "PROPERTIES", go to the beginning of the word you typed,
>> and do
>
> AFAIU, it then means that any parser/font-lock keywords may fail to
> fontify case-insensitive keywords that contain "i" in Turkish language
> environment.

To demonstrate the problem, let me show a small ECM with
outline-minor-mode:

1. emacs -Q
2. M-x outline-minor-mode <RET>
3. Insert

this
asd
THIS
asd

4. M-: (setq outline-regexp "^this")
5. M-x outline-cycle-buffer <RET>
6. Observe

this...
THIS...

7. M-x outline-show-all <RET>
8. M-x set-language-environment <RET> Turkish <RET>
9. M-x outline-cycle-buffer <RET>
10. Observe

this...

"THIS" is hidden, which is unexpected.

-- 
Ihor Radchenko // yantar92,
Org mode contributor,
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