bug#46177: 27.1; Display problem with minibuffer overlay when using display property

[Clemens]

When using an overlay with an `after-string` which uses `display`
the prompt background bleeds into the after string:


(set-face-attribute 'minibuffer-prompt nil :background "purple")

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


While I would expect it to be displayed like when using:


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