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Another overlay display bug

From: Richard Stallman
Subject: Another overlay display bug
Date: Mon, 10 Dec 2007 10:19:14 -0500

Would someone please fix this, then ack?

To: address@hidden
From: Joe Wells <address@hidden>
Date: Sat, 20 Oct 2007 06:43:43 +0100
In-Reply-To: <address@hidden> (Joe Wells's message of "Sat\,
        20 Oct 2007 06\:32\:19 +0100")
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Subject: Re: two display bugs involving interactions between after-string
        and display properties of adjacent overlays

Joe Wells <address@hidden> writes:

> Here are two more display bugs I found while trying to improve the
> code in tex-fold.el in AUCTeX.

Here is a third such bug.

> These bugs involve interactions between after-string and display
> properties of adjacent overlays.


> I'm assuming this macro in my reproduction code below:
>   (defmacro test-in-fresh-buffer-and-window (&rest body)
>     `(progn
>        (delete-other-windows)
>        (kill-buffer (get-buffer-create "xyzzy"))
>        (let ((xyzzy-buf (get-buffer-create "xyzzy")))
>          (set-buffer xyzzy-buf)
>          (display-buffer xyzzy-buf)
>          ,@body
>          )))


> BUG #1:  ...

> BUG #2:  ...

BUG #3:  An overlay's after-string property is not displayed if an
immediately following overlay has the empty string as its display

Reproduce with this expression:

   (insert "ABCD")
   (let ((o1 (make-overlay 2 3))
         (o2 (make-overlay 3 4)))
     (overlay-put o1 'after-string "1")
     (overlay-put o2 'display "")))

The above expression should display ?AB1D?.
The above expression wrongly actually displays ?ABD?.

> ======================================================================
> In GNU Emacs 22.1.1 (i686-pc-linux-gnu, GTK+ Version 2.8.20) ...

Same details as in last message.

I hope this bug report is helpful.


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