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

[Po Lu]

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.