GNU bug report logs - #26291
In mode-line-format, `:propertize' drops some existing text properties

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Package: emacs;

Reported by: Clément Pit-Claudel <cpitclaudel <at> gmail.com>

Date: Wed, 29 Mar 2017 02:40:01 UTC

Severity: minor

Tags: moreinfo

Merged with 28595

Found in version 26.0.60

Fixed in version 26.1

Done: Clément Pit--Claudel <clement.pitclaudel <at> live.com>

Bug is archived. No further changes may be made.

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Report forwarded to bug-gnu-emacs <at> gnu.org:
bug#26291; Package emacs. (Wed, 29 Mar 2017 02:40:01 GMT) Full text and rfc822 format available.
Acknowledgement sent to Clément Pit-Claudel <cpitclaudel <at> gmail.com>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs <at> gnu.org. (Wed, 29 Mar 2017 02:40:02 GMT) Full text and rfc822 format available.

Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

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.
Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#26291; Package emacs. (Wed, 29 Mar 2017 14:29:01 GMT) Full text and rfc822 format available.

Message #8 received at 26291 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Clément Pit-Claudel <cpitclaudel <at> gmail.com>
Cc: 26291 <at> debbugs.gnu.org
Subject: Re: bug#26291: In mode-line-format,
 `:propertize' drops some existing text properties
Date: Wed, 29 Mar 2017 17:28:34 +0300

> From: Clément Pit-Claudel <cpitclaudel <at> gmail.com>
> Date: Tue, 28 Mar 2017 19:42:02 -0400
> 
> (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?

Which docs were you reading that led you to believe the above should
work?

(And btw, why did you use backticks here?  I don't think they are
needed in this case.)
Forcibly Merged 26291 28559. Request was from Noam Postavsky <npostavs <at> users.sourceforge.net> to control <at> debbugs.gnu.org. (Mon, 25 Sep 2017 23:53:01 GMT) Full text and rfc822 format available.
Disconnected #28559 from all other report(s). Request was from Noam Postavsky <npostavs <at> users.sourceforge.net> to control <at> debbugs.gnu.org. (Tue, 26 Sep 2017 00:20:02 GMT) Full text and rfc822 format available.
Removed tag(s) fixed. Request was from Noam Postavsky <npostavs <at> users.sourceforge.net> to control <at> debbugs.gnu.org. (Tue, 26 Sep 2017 00:20:02 GMT) Full text and rfc822 format available.
Forcibly Merged 26291 28595. Request was from Noam Postavsky <npostavs <at> users.sourceforge.net> to control <at> debbugs.gnu.org. (Tue, 26 Sep 2017 00:20:02 GMT) Full text and rfc822 format available.
bug archived. Request was from Debbugs Internal Request <help-debbugs <at> gnu.org> to internal_control <at> debbugs.gnu.org. (Sat, 28 Oct 2017 11:24:07 GMT) Full text and rfc822 format available.
This bug report was last modified 6 years and 175 days ago.

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