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

[Clemens]

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.