Subject: bug#46718: 27.1; truncate-lines in minibuffer prevents auto resize

From: Clemens <[email-masked]>
Date: Tue, 23 Feb 2021 14:44:20 +0100

Hi,

in Selectrum we are using an overlay after-string to display completion
candidates within the minibuffer. We also want to truncate-lines to 
prevent wrapping for long lines. When using:

;; emacs -Q
(setq resize-mini-windows t)
(minibuffer-with-setup-hook
     (lambda ()
       (setq-local truncate-lines t)
       (let ((ov (make-overlay (point-max) (point-max)))
	    (minibuf-after-string " \nOne\nTwo\nThree"))
	(put-text-property 0 1 'cursor t minibuf-after-string)
	(overlay-put ov 'after-string minibuf-after-string)))
   (read-string ":"))

the mini window will not resize but when commenting out the setting for
truncate-lines it resizes appropriately.