Re: Question about completion behavior

[Eli Zaretskii]

> Date: Sun, 13 Mar 2022 19:50:56 +0100
> From: Ergus <spacibba@aol.com>
> Cc: Po Lu <luangruo@yahoo.com>, Eli Zaretskii <eliz@gnu.org>,
>  Stefan Monnier <monnier@iro.umontreal.ca>, emacs-devel@gnu.org
> 
> >  (defvar completion-header-format
> >    (propertize "%s possible completions:"
> >                'face 'shadow
> >                :help "Please select a completion")
> >    "Format of completion header.")
> >
> Interesting... I couldn't find the propertize function in the text
> property section of the manual...

It's described in the second section of the Text Properties chapter;
the section's name is "Changing Text Properties".  So it is strange
that you didn't find it.