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bug#13236: 24.3.50; insert-char case-insensitivity damaged by completion

From: Lars Ingebrigtsen
Subject: bug#13236: 24.3.50; insert-char case-insensitivity damaged by completion customizations
Date: Fri, 16 Aug 2019 00:18:56 -0700
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

Carsten Bormann <address@hidden> writes:

> insert-char prompts for a Unicode character name.
> As those are typically all upper case, and the user is likely to enter
> lower case input, the completion needs to be case-insensitive.
> This works as long as there is no customization of the completion.
> E.g., 
> M-x insert-char RET gree TAB
> shows a number of greek characters, and a number of characters whose
> 1) For
> (setq completion-styles '(partial-completion initials))
> M-x insert-char RET gree TAB
> leads to:
> completion--some: Internal error: GREEN BOOK doesn't match \`gree

(I'm going through old bug reports that have unfortunately gotten no
responses yet.)

I tried reproducing this in Emacs 27, and I didn't get that error
message -- instead TAB seemed to complete as normal.

Are you still seeing this error in modern Emacsen?

> 2) For
> (setq completion-pcm-complete-word-inserts-delimiters t)
> M-x insert-char RET SPC ellipsis TAB
> (note the SPC) at the prompt doesn't provide a match, while
> M-x insert-char RET SPC ELLIPSIS TAB
> shows several character names that contain the word ELLIPSIS.

Ditto with this case -- I get lots of ELLIPSIS completions with "

> I didn't try this exhaustively, but it seems there are several
> interactions the current code does not consider.
> Patching read-char-by-name like this seems to make work the cases 
> I'm interested in:
>    (let* ((enable-recursive-minibuffers t)
>        (input
> +          (let ((completion-ignore-case t)) ; HACK
>         (completing-read

Looks like pretty much this was done in 2013 -- the code now reads:

  (let* ((enable-recursive-minibuffers t)
         (completion-ignore-case t)

(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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