GNU bug report logs - #79059
31.0.50; eshell-emit-prompt errors when front-sticky or rear-nonsticky properties are set to t

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From: Jim Porter <jporterbugs <at> gmail.com>
To: László Vaskó <hello <at> vlaci.email>, 79059 <at> debbugs.gnu.org
Subject: bug#79059: 31.0.50; eshell-emit-prompt errors when front-sticky or rear-nonsticky properties are set to t
Date: Tue, 22 Jul 2025 09:14:46 -0700

On 7/20/2025 3:00 AM, László Vaskó wrote:
> Hello,
> 
> Since df288d2e414 (bug#74230) eshell is more careful adding text
> properties to prompts using `eshell--append-text-property'. It's
> implementation assumes that `get-text-property' will always return a
> list. This is not true, as both `front-sticky' and `rear-nonsticky'
> properties can be set to t.
> 
> Repro:
> 
> -- 8< --
> cat <<EOF > /tmp/init-eshell-propertized-prompt.el
> ;; -*- lexical-binding: t; -*-
> (setq eshell-prompt-function
>        (defun propertizing-prompt ()
>          (setq eshell-prompt-string (propertize "test" 'rear-nonsticky t))))
> (eshell)
> EOF
> emacs -Q --batch --load /tmp/init-eshell-propertized-prompt.el
> -- 8< --

When does this come up in practice? I think this could only happen if 
some code specifically customizes 'eshell-prompt-function' to set the 
stickiness properties this way. Is doing that necessary for something 
else that I'm missing?

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