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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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.
This bug report was last modified 7 years and 239 days ago.

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