bug#70697: 30.0.50; Frame parameter alpha-background is ignored for fringe bitmaps & internal borders

[Eli Zaretskii]

Ping!  How should we proceed with this issue?

> From: Aleksandar Dimitrov <mail@aleks.bg>
> Cc:  70697@debbugs.gnu.org, Eli Zaretskii <eliz@gnu.org>
> Date: Mon, 03 Jun 2024 22:24:27 +0200
> 
> Po Lu <luangruo@yahoo.com> writes:
> 
> >>> From: Aleksandar Dimitrov <mail@aleks.bg>
> >>> Date: Thu, 16 May 2024 16:26:47 +0200
> >>> CC: eliz@gnu.org,  70697@debbugs.gnu.org
> >
> > [...]
> >
> >>> When compiling Emacs with --with-toolkit=lucid, the above patch
> >>> works. Fringe bitmaps' backgrounds are now transparent.
> >>> As before, the internal borders aren't transparent.
> >
> > I suppose you meant to write `--with-x-toolkit=lucid', where
> > alpha-background is not supported at all, so I'm very much confused as
> > to why this is so.  Did you really configure Emacs
> > `--with-toolkit=lucid'?  If you did, you would have been testing a GTK
> > build.
> 
> Welp, I never said I'm good at this :D
> I didn't know there was a difference between the --with-toolkit and
> --with-x-toolkit options. The former isn't documented in ./configure
> --help, it seems. I've opted to only use --with-x-toolkit from now on.
> 
> I have conducted some experiments now:
> --with-x-toolkit=lucid & your patch:
> No transparency support.
> 
> --with-x-toolkit=gtk3 & your patch:
> Transparency in fringes works.
> Internal borders are NOT transparent.
> This is identical to my previous test with --with-toolkit=lucid, which
> wasn't doing what I expected it to.
> 
> --with-pgtk & your patch:
> Transparency in fringes DOES NOT work
> Internal borders ARE transparent
> (also, Emacs is very slow, e.g. when rendering company popups, but
> that's unrelated)
> 
> All of these tests are conducted with the above Emacs version and on
> Wayland.
>