Gerd Möllmann <gerd.moellmann@gmail.com> writes:

> Gerd Möllmann <gerd.moellmann@gmail.com> writes:
>
>> Confirmed, 71505b723c9fb9de20f6d38be7c73d595e9be3ce it is.
>
> Don't know if this is directly related, but playing with
>
>   (defun foo ()
>     (interactive)
>     (with-current-buffer (get-buffer-create "*foo*")
>       (erase-buffer)
>       (insert "12345")
>       (put-text-property (point-min) (point)
>                          'display '(min-width (5)))
>       (put-text-property (point-min) (point)
>                          'mouse-face 'highlight)
>       (insert "abc")
>       (display-buffer (current-buffer))))
>
> shows that if the text, in this case "12345", is longer than min-width, a
> space is added, and if it's equal to min-width, no space is added.

That attached patch fixes both the above problem and the the one in the
mode-line.