GNU bug report logs - #1201
Another overlay display bug

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Message #5 received at submit <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Richard Stallman <rms <at> gnu.org>
To: emacs-pretest-bug <at> gnu.org
Subject: Another overlay display bug
Date: Sun, 19 Oct 2008 01:00:55 -0400

Here's another bug that was reported a year ago
which I think should not be forgotten.

From: Richard Stallman <rms <at> gnu.org>
Content-Type: text/plain; charset=ISO-8859-15
To: emacs-devel <at> gnu.org
Subject: Another overlay display bug
Reply-To: rms <at> gnu.org
Message-Id: <E1IjVDM-0001BJ-AH <at> fencepost.gnu.org>
Date: Mon, 10 Dec 2007 10:19:14 -0500

Would someone please fix this, then ack?

To: bug-gnu-emacs <at> gnu.org
From: Joe Wells <jbw <at> macs.hw.ac.uk>
Date: Sat, 20 Oct 2007 06:43:43 +0100
In-Reply-To: <86k5pi9wrg.fsf <at> macs.hw.ac.uk> (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 <jbw <at> macs.hw.ac.uk> 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.

Ditto.

> 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
>          )))

Ditto.

> 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
property.

Reproduce with this expression:

  (test-in-fresh-buffer-and-window
   (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.

-- 
Joe

Message #10 received at 1201 <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Chong Yidong <cyd <at> stupidchicken.com>
To: 1201 <at> debbugs.gnu.org
Subject: Re: Another overlay display bug
Date: Thu, 23 Oct 2008 21:28:53 -0400

Note: this is discussed at

http://lists.gnu.org/archive/html/emacs-devel/2008-02/msg02997.html

Message #15 received at 1201 <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Chong Yidong <cyd <at> stupidchicken.com>
To: 1201 <at> debbugs.gnu.org
Subject: Re: Another overlay display bug
Date: Thu, 23 Oct 2008 23:25:16 -0400

> Note: this is discussed at
>
> http://lists.gnu.org/archive/html/emacs-devel/2008-02/msg02997.html

The original bug that led to the problematic checkin is here:

http://lists.gnu.org/archive/html/emacs-devel/2005-05/msg00580.html

Message #20 received at 1201-done <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Chong Yidong <cyd <at> stupidchicken.com>
To: 1201-done <at> debbugs.gnu.org
Subject: Re: Another overlay display bug
Date: Fri, 24 Oct 2008 15:01:08 -0400

I've checked in a fix.

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