Subject: bug#46176: 27.1; Display problem in minibuffer overlay when using display property

From: Clemens <[email-masked]>
Date: Fri, 29 Jan 2021 18:42:33 +0100

When using an overlay `after-string` which uses the `display` property
the string uses the minibuffer prompt face for some reason:

(minibuffer-with-setup-hook
     (lambda ()
       (overlay-put
        (make-overlay (point-max) (point-max) nil t t)
        'after-string (propertize "world" 'display " minibuffer"
				 'face 'warning)))
   (read-string "Hello"))

I would expect the string " minibuffer" to be displayed like when using:

(minibuffer-with-setup-hook
     (lambda ()
       (overlay-put
        (make-overlay (point-max) (point-max) nil t t)
        'after-string (propertize " minibuffer" 'face 'warning)))
   (read-string "Hello"))