Re: TAGS completion with (setq-local completion-ignore-case t)

[Morgan Willcock]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Morgan Willcock <morgan@ice9.digital>
>> Cc: emacs-devel@gnu.org
>> Date: Sat, 09 Mar 2024 14:06:39 +0000
>> 
>> Eli Zaretskii <eliz@gnu.org> writes:
>> 
>> > You need to set tags-case-fold-search, not the buffer-local value of
>> > completion-ignore-case.  That's because the commands in etags.el look
>> > at tags-case-fold-search to decide whether they should ignore
>> > letter-case.
>> 
>> Setting tags-case-fold-search to t (buffer-local or not) doesn't seem to
>> have any effect when completion-ignore-case is also set to t.
>> 
>>   emacs -Q --eval "(progn \
>>                      (pop-to-buffer (get-buffer-create \"test\")) \
>>                      (setq-local completion-ignore-case t) \
>>                      (setq-local tags-case-fold-search t) \
>
> Don't use setq-local, use setq.  Or let-bind it, like this:
>
>   (progn
>     (pop-to-buffer (get-buffer-create "test"))
>     (let ((tags-case-fold-search t))
>       (insert "is")
>       (complete-tag)
>       (complete-tag)))

The code example is just to recreate the problem.  This affects the
completion mechanism in the buffer that the user has direct access to
with key-bindings.

i.e. If the user types "is" and then presses C-M-i there are no
completions available.

-- 
Morgan Willcock