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

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From: Eli Zaretskii <eliz <at> gnu.org>
To: 28595 <at> debbugs.gnu.org, clement.pitclaudel <at> live.com
Subject: bug#28595: In mode-line-format, `:propertize' drops some existing text properties
Date: Mon, 25 Sep 2017 19:52:57 +0100

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.

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