GNU bug report logs - #80022
31.0.50; Commit 75507912875 breaks icomplete-show-matches-on-no-input for Pgtk

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Sean Whitton <spwhitton <at> spwhitton.name>
To: bug-gnu-emacs <at> gnu.org
Subject: 31.0.50; Commit 75507912875 breaks
 icomplete-show-matches-on-no-input for Pgtk
Date: Wed, 17 Dec 2025 14:57:09 +0000

X-debbugs-cc: luangruo <at> yahoo.com

'git bisect' reveals that commit 75507912875 ("Support
`toolkit-theme-set-functions' on Android and execute hooks safely"),
and its typo fix 860996afb00, breaks icomplete-show-matches-on-no-input
sometimes.

In emacs -q, with a pgtk build, evaluate:

--8<---------------cut here---------------start------------->8---
(progn
  (defun spw/sway-completing-read (prompt collection &rest optional-args)
    (let* ((frame-inhibit-implied-resize 'force) ; cf. Emacs bug#76275
	   (frame (make-frame `((title . "Emacs Sway input")
				(minibuffer . only)
				(display . ,(getenv "WAYLAND_DISPLAY"))))))
      (unwind-protect
	  (with-selected-frame frame
	    (set-window-scroll-bars (minibuffer-window frame) 0 nil 0 nil t)
	    (apply #'completing-read prompt collection optional-args))
	(delete-frame frame))))
  (setopt icomplete-show-matches-on-no-input t)
  (icomplete-mode 1)
  (spw/sway-completing-read "Choose: " '("foo" "bar")))
--8<---------------cut here---------------end--------------->8---

The expected result, and the result before commit 75507912875, is that
"foo" and "bar" are immediately visible as possible completions.
However, after that commit, they don't appear until (e.g.) C-, or C-. is
typed.  This is a regression of longstanding behaviour and is
essentially a case where icomplete-show-matches-on-no-input fails to
function.

I have Sway configuration to resize the frame that opens to a fixed
size, pasting here in case it is relevant:
--8<---------------cut here---------------start------------->8---
for_window [title="^Emacs Sway input$"] \
	floating enable, sticky enable, \
	resize set width 90 ppt, resize set height 90 px, \
	border pixel 2, move position 5 ppt 10 px
--8<---------------cut here---------------end--------------->8---

Po Lu, could you investigate?  Thanks.

-- 
Sean Whitton

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