GNU bug report logs - #34771
27.0.50; object is a window sometimes although it should be a buffer in conditional display spec

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Tassilo Horn <tsdh <at> gnu.org>
Subject: bug#34771: closed (Re: bug#34771: 27.0.50; object is a window
 sometimes although it should be a buffer in conditional display spec)
Date: Thu, 07 Mar 2019 20:11:03 +0000

[Message part 1 (text/plain, inline)]

Your bug report

#34771: 27.0.50; object is a window sometimes although it should be a buffer in conditional display spec

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 34771 <at> debbugs.gnu.org.

-- 
34771: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=34771
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Eli Zaretskii <eliz <at> gnu.org>
To: Tassilo Horn <tsdh <at> gnu.org>
Cc: 34771-done <at> debbugs.gnu.org
Subject: Re: bug#34771: 27.0.50;
 object is a window sometimes although it should be a buffer in
 conditional display spec
Date: Thu, 07 Mar 2019 22:09:37 +0200

> From: Tassilo Horn <tsdh <at> gnu.org>
> Cc: 34771 <at> debbugs.gnu.org
> Date: Thu, 07 Mar 2019 17:43:53 +0100
> 
> > I pushed it now, please take a look.
> 
> Yes, it works now.

OK, closing.  Thanks.

[Message part 3 (message/rfc822, inline)]

From: Tassilo Horn <tsdh <at> gnu.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 27.0.50;
 object is a window sometimes although it should be a buffer in
 conditional display spec
Date: Wed, 06 Mar 2019 18:42:19 +0100

The docs state:

,----[ (info "(elisp)Other Display Specs") ]
|    You can make any display specification conditional.  To do that,
| package it in another list of the form ‘(when CONDITION . SPEC)’.  Then
| the specification SPEC applies only when CONDITION evaluates to a
| non-‘nil’ value.  During the evaluation, ‘object’ is bound to the string
| or buffer having the conditional ‘display’ property.  ‘position’ and
| ‘buffer-position’ are bound to the position within ‘object’ and the
| buffer position where the ‘display’ property was found, respectively.
| Both positions can be different when ‘object’ is a string.
`----

So in a conditional display spec, object should always be a buffer.
However, that doesn't seem to be the reality.  Sometimes, it is also a
window.

Here's a recipe for the current master:

$ emacs -q

In *scratch* insert and evaluate:

(insert (propertize "foobar" 'display
		    `(when (get-buffer-window object)
		       . ,(format "%s" (random)))) "\n")

Now move point over the displayed random number, hit and hold C-l, or
do whatever triggers redisplay.

Now I have this in *Messages*:

Error during redisplay: (eval (get-buffer-window object)) signaled (wrong-type-argument stringp #<window 3 on *scratch*>) [33 times]


In GNU Emacs 27.0.50 (build 8, x86_64-pc-linux-gnu, GTK+ Version 3.24.5)
 of 2019-03-06 built on thinkpad-t440p
Repository revision: 2260e48d2eeaa9ea2b9c17389cc25d00f85c414c
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12004000
System Description: Arch Linux

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Wrote /home/horn/.gnus.d/.newsrc.eld
20190306T182626.864> Saving /home/horn/.gnus.d/.newsrc.eld...done

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