Fix the autocomplete function for the self keyword.

[Vilcrow]

Fixes #85833

UPD: I will try to fix the bug with singleton in the coming days. While I'm converting the PR into a draft. there is no bug with singleton.

[am45-001]

After implementing this pull request and compiling the 4.2.1 source code, it still fails to treat Singletons properly.
self. completion is fixed with this though. I haven't tried the master branch yet, so maybe there's something different there.
edit: Just realized, that singletons weren't intended to be fixed by this one, lol.

[adamscott]

CC. @dalexeev @anvilfolk

[Vilcrow]

I didn't find any problems with singleton. Everything seems to be working. Describe in more detail what it is @am45-001 .
Have you scrolled through the entire list of suggested completions for singleton?

[am45-001]

@Vilcrow , after taking another look, I seem to have been mistaken about singletons, and RenderingServer in particular.

[HolonProduction]

As stated on the original issue, I don't quite understand the reason for the if statement. While you are at this code again, could you maybe add an explanatory comment, since its purpose isn't directly obvious.

[vnen]

As stated on the original issue, I don't quite understand the reason for the if statement. While you are at this code again, could you maybe add an explanatory comment, since its purpose isn't directly obvious.

I also don't understand how this could ever be false. With self being used explicitly, there's no way to also use super AFAICT.

In any case, even if the if is necessary for some reason, the r_type.type.is_meta_type = false line should be done after the if block, as it would apply to both branches.

[Vilcrow]

Initially, this code snippet was entered elsewhere(see #72789), where the if block made sense. Then it was moved here without the necessary adjustments(my bad).

[akien-mga]

Thanks!

[YuriSizov]

Cherry-picked for 4.2.2.