bug#53916: 29.0.50; pgtk: Gtk-WARNING with popup menu

[Eli Zaretskii]

> Cc: Stephen Berman <stephen.berman@gmx.net>, 53916@debbugs.gnu.org
> Date: Fri, 11 Feb 2022 14:26:21 +0800
> From:  Po Lu via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> Po Lu <luangruo@yahoo.com> writes:
> 
> > Great, does anyone know what "%s" parameters to `add_to_log' are
> > expected in?  UTF-8?
> 
> About 5 seconds after sending this, I realized that it accepts Lisp
> objects and format control strings like `format'.

Yes, the arguments are Lisp strings.

> So hopefully that means it will be okay to print out unibyte strings via
> that mechanism, since I don't want to go down the rabbit hole of what
> text encodings various libraries using the GLib logging system subject
> it to.

Just use DECODE_SYSTEM, the encoding is already figured out for you.

Please do NOT use the original unibyte strings, they are likely to
display as gibberish in some cases.