GNU bug report logs - #19032
24.4; icomplete cannot select matches with C-x b with no input

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From: Juri Linkov <juri <at> linkov.net>
To: João Távora <joaotavora <at> gmail.com>
Cc: 19032 <at> debbugs.gnu.org, 43120 <at> debbugs.gnu.org, Stefan Monnier <monnier <at> iro.umontreal.ca>, Lars Ingebrigtsen <larsi <at> gnus.org>, OGAWA Hirofumi <hirofumi <at> mail.parknet.co.jp>, Sean Whitton <spwhitton <at> spwhitton.name>
Subject: bug#19032: bug#43120: 28.0.50; fido-mode: M-j before completions appear selects wrong choice
Date: Thu, 10 Sep 2020 21:51:34 +0300

> Though I'm starting to think that when require-match is nil, an
> icomplete user wouldn't want the new icomplete-show-matches-on-no-input
> behaviour anyway.

This is confusing, I don't understand why behaviour of
icomplete-show-matches-on-no-input should depend on require-match.

Here are two examples that produce a different result.

The first example is from hi-lock-read-face-name:

(defvar hi-history nil)
(icomplete-mode)
(let ((icomplete-show-matches-on-no-input t)
      (defaults '("hi-yellow" "hi-green"))
      (hi-history '("hi-blue")))
  (completing-read
   (format-prompt "Highlight using face" (car defaults))
   obarray 'facep t nil 'hi-history defaults))

displays this prompt:

  Highlight using face (default hi-yellow): {link | menu | bold ...

Typing RET returns "link" (and sometimes returns "hi-blue" from the history),
but never returns the expected default value "hi-yellow".

Whereas the second example from tab-bar-switch-to-tab
works correctly since its arg require-match is nil:

(let ((icomplete-show-matches-on-no-input t)
      (defaults '("yellow" "green"))
      (hi-history '("blue")))
  (completing-read
   (format-prompt "Switch to tab by name" (car defaults))
   defaults nil nil nil 'hi-history defaults))

displays this prompt:

  Switch to tab by name (default yellow): {green | yellow}

Typing RET returns the default value "yellow", not the first candidate "green".

This makes the behaviour of icomplete-show-matches-on-no-input
unpredictable, and thus in some cases dangerous.

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