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Re: before-string property has no effect if display property is empty st
From: |
Joe Wells |
Subject: |
Re: before-string property has no effect if display property is empty string |
Date: |
Wed, 19 Sep 2007 17:07:34 +0100 |
User-agent: |
Gnus/5.11 (Gnus v5.11) Emacs/22.1 (gnu/linux) |
Richard Stallman <address@hidden> writes:
> The documentation leads me to believe that the before-string and
> display properties of an overlay should be orthogonal. However, the
> before-string is not displayed if the display property is the empty
> string.
>
> I think the thing to do is document this.
This is not clear. For example, linum.el makes empty overlays with
before-string properties and no display property at all. And this
works. So why shouldn't it work when there is a display property that
is the empty string?
> Does the same happen for the after-string?
It works fine with after-string. The following expression displays
“AXXXC” (correctly):
(let ((buf (get-buffer-create "foo")))
(with-current-buffer buf
(display-buffer buf)
(erase-buffer)
(dolist (o (overlays-in (point-min) (point-max)))
(delete-overlay o))
(insert "ABC")
(let ((o (make-overlay 2 3))
(s (make-string 3 ?X)))
(overlay-put o 'display "")
(overlay-put o 'after-string s))))
Given that it works with after-string, this is evidence for
interpreting the behavior with before-string as a bug.
--
Joe