GUI type variations don't work

[DimitriyPS]

Bugsquad edit: This refers to #57942.

Godot version

3,5 b4

System information

All OS

Issue description

I create a theme with inherited style:

I want to make a style selection, but there is none:

Steps to reproduce

1. Open a project
2. Make a style selection for the button

Minimal reproduction project

Т2.zip

[KoBeWi]

Bbbbutton should appear on the list (it's correctly configured as subtype of Button). Same issue in 4.0

[timothyqiu]

This is expected. Only type variantions in the project's default theme (gui/theme/custom) will be listed in the dropdown.

See description in #50169.

[KoBeWi]

Seems like all is documented under set_type_variation(), so this can be closed.

[DimitriyPS]

And this greatly limits the use ... for example, now I use a code-generated theme ... and in another project I have two code-generated interface themes at once.

This innovation... in the announcement looked very useful.

[KoBeWi]

You can't select them from list, but you can write the type by manually.

You can open a proposal if you want this changed, but this might require complex changes to Theme, as stated in the original PR.

[DimitriyPS]

Well, at least now I understand why it didn't work for me. I won’t write an application for revision ... I guess I won’t see it in the coming years ... so it makes no sense for me to focus on this.

[DimitriyPS]

Experimented a bit... I can't do it in the editor, but I can do it in code. And yes! It is very comfortable!