GNU bug report logs - #42101
icomplete-fido-ret doesn't always use minibuffer-default when input is empty

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From: João Távora <joaotavora <at> gmail.com>
To: Andrew Schwartzmeyer <andrew <at> schwartzmeyer.com>
Cc: 42101 <at> debbugs.gnu.org
Subject: bug#42101: icomplete-fido-ret doesn't always use minibuffer-default when input is empty
Date: Mon, 29 Jun 2020 15:00:16 +0100

Andrew Schwartzmeyer <andrew <at> schwartzmeyer.com> writes:

> Hi,
>
> Funny bug, haven’t figured out the cause. It may be hard to repro.
>
> If you have some amount of minibuffer history, you can cause
> icomplete-fido-ret to not accept the minibuffer-default. An example is
> having history such that 'C-h v' when point is on ‘completion-styles’
> causes ‘completion-styles-alist’ to be the first history
> element. Since the minibuffer-default shows ‘completion-styles’ (being
> that it’s under point, and I’ve not entered any text into the
> minibuffer), I’d expect RET to choose ‘completion-styles’, but instead
> it choses ‘completion-styles-alist’ (the head of the presented
> candidates, ‘completion-styles’ is instead the second candidate).
>
> This repros in fido-mode, but not icomplete-mode. I took a look at the
> relevant functions called on RET for these modes but am having trouble
> finding the issue.

I can't reproduce this.  I think the first step is for you to try to
identify which sequence of actions as performed from an Emacs
session started with -Q lead to the problem.  For the record, I tried

Emacs -Q (master of around two weeks ago)

  C-h v completion-styles RET
  C-h v completion-styles-alist RET

type "completion-styles" in *scratch* buffer.  With cursor on word.

  C-h v RET (quickly, before the completions appear)
  C-h v RET (slowly, letting the completions appear)

Both approaches lead to the variable `completion-styles` being
described.

João

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