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

[Eli Zaretskii]

> From: Po Lu <luangruo@yahoo.com>
> Cc: rpluim@gmail.com,  stephen.berman@gmx.net,  53916@debbugs.gnu.org
> Date: Fri, 11 Feb 2022 08:59:08 +0800
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> > Can such a log handler put those warnings in *Messages*?
> >> 
> >> Yes.
> >
> > I wouldn't recommend mixing GTK diagnostics with *Messages*.  Why not
> > have a separate buffer for the GTK messages?
> 
> I think it would be confusing to have such a buffer suddenly appear.

Why confusing?  We already have in Emacs 28 and later a buffer named
*Async-native-compile-log* that "suddenly appears" as soon as Emacs
needs for the first time to natively-compile a Lisp file.  How is this
case different?