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

[Po Lu]

>> 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.