[Bug 54563] The gif is displaying wrongly, with weird backgrounds of various colors

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=54563

--- Comment #7 from [e-mail] ---
(In reply to Piotr Caban from comment #6)
> I've sent a patch that should fix it:
> https://gitlab.winehq.org/wine/wine/-/merge_requests/2323

I have two questions about this submission.
1. This commit seems to fail on "test-64"
2. I know "New code is written to match tests and fix real applications."

But I have a question when "a transparent index set", why do we return null on
line 3887, instead of the transparent color value,

i.e.
> else if(bitmap->prop_item[i].id == PropertyTagIndexTransparent)
>        {
>            return *(BYTE*)bitmap->prop_item[i].value;
>        }

Am I misunderstanding somewhere?
Thanks for replay.