bug#74028: menu bar background becomes transparent if alpha-background is less than 100.

[Eli Zaretskii <eliz@gnu.org>]

> From: Po Lu <luangruo@yahoo.com>
> Cc: amano.kenji@proton.me,  74028@debbugs.gnu.org
> Date: Sun, 08 Dec 2024 08:04:56 +0800
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Ping! Ping!  Po Lu, could you please respond?
> >
> >> Cc: amano.kenji@proton.me, 74028@debbugs.gnu.org
> >> Date: Sat, 23 Nov 2024 14:12:09 +0200
> >> From: Eli Zaretskii <eliz@gnu.org>
> >> 
> >> Ping!
> >> 
> >> > Cc: 74028@debbugs.gnu.org
> >> > Date: Sat, 09 Nov 2024 11:20:20 +0200
> >> > From: Eli Zaretskii <eliz@gnu.org>
> >> > 
> >> > > Date: Sat, 26 Oct 2024 11:57:56 +0000
> >> > > From:  "amano.kenji" via "Bug reports for GNU Emacs,
> >> > >  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> >> > > 
> >> > > I use gtk emacs 29.4 on sway wayland compositor.
> >> > 
> >> > Po Lu, any comments or suggestions?
> 
> Right, apologies for the belated response.  This is a GTK limitation:
> `alpha-background' requires that the GTK-configured window background be
> removed, or that background will prompt GTK to set a
> _NET_WM_OPAQUE_REGION property encompassing the entire window which
> interferes with Emacs's partial transparency, but removing this
> background renders the menu-bar transparent, as it does not draw its
> background independently.

Thanks.  Would you please write an entry for PROBLEMS about this?