GNU bug report logs - #28595
In mode-line-format, `:propertize' drops some existing text properties

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Clément Pit-Claudel <cpitclaudel <at> gmail.com>
Subject: bug#26291: closed (Re: bug#28595: In mode-line-format,
 `:propertize' drops some existing text properties)
Date: Tue, 26 Sep 2017 14:34:03 +0000

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Your bug report

#28595: In mode-line-format, `:propertize' drops some existing text properties

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 26291 <at> debbugs.gnu.org.

-- 
28595: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=28595
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Clément Pit--Claudel <clement.pitclaudel <at> live.com>
To: Eli Zaretskii <eliz <at> gnu.org>, bug-gnu-emacs <at> gnu.org,
 28595-done <at> debbugs.gnu.org
Subject: Re: bug#28595: In mode-line-format, `:propertize' drops some existing
 text properties
Date: Tue, 26 Sep 2017 01:10:40 +0200

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On 2017-09-25 20:52, Eli Zaretskii wrote:
> On September 24, 2017 2:03:02 PM GMT+01:00, "Clément Pit--Claudel" <clement.pitclaudel <at> live.com> wrote:
>> Hi all,
>>
>> Based on the docs, the three following forms should yield the same
>> results:
>>
>> (format-mode-line `(:propertize #("AB" 1 2 (x 0)) y 0))
>> (format-mode-line `(:propertize ("A" #("B" 0 1 (x 0))) y 0))
>> (format-mode-line '(:propertize ("A" (:propertize "B" x 0)) y 0))
>>
>> But they don't:
>>
>> (format-mode-line `(:propertize #("AB" 1 2 (x 0)) y 0))
>> => #("AB" 0 2 (y 0)) ;; x 0 is dropped
>>
>> (format-mode-line '(:propertize ("A" (:propertize "B" x 0)) y 0))
>> ⇒ #("AB" 0 1 (y 0) 1 2 (x 0)) ;; y 0 is dropped on 1..2
>>
>> (format-mode-line `(:propertize ("A" #("B" 0 1 (x 0))) y 0))
>> ⇒ #("AB" 0 1 (y 0) 1 2 (y 0 x 0)) ;; Seems right
>>
>> Am I misreading the docs?
>> Clément.
> 
> You already asked the same in bug#26291.

Ouch. Sorry.

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From: Clément Pit-Claudel <cpitclaudel <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: In mode-line-format, `:propertize' drops some existing text properties
Date: Tue, 28 Mar 2017 19:42:02 -0400

Hi all,

Based on the docs, the three following forms should yield the same results:

(format-mode-line `(:propertize #("AB" 1 2 (x 0)) y 0))
(format-mode-line `(:propertize ("A" #("B" 0 1 (x 0))) y 0))
(format-mode-line '(:propertize ("A" (:propertize "B" x 0)) y 0))

But they don't:

(format-mode-line `(:propertize #("AB" 1 2 (x 0)) y 0))
=> #("AB" 0 2 (y 0)) ;; x 0 is dropped

(format-mode-line '(:propertize ("A" (:propertize "B" x 0)) y 0))
⇒ #("AB" 0 1 (y 0) 1 2 (x 0)) ;; y 0 is dropped on 1..2

(format-mode-line `(:propertize ("A" #("B" 0 1 (x 0))) y 0))
⇒ #("AB" 0 1 (y 0) 1 2 (y 0 x 0)) ;; Seems right

Am I misreading the docs?
Clément.

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