Tree.propagate_check() does not uncheck parents

[KoBeWi]

Godot version

4.2 dev1

System information

Windows 10.0.19045 - Vulkan (Forward+) - dedicated NVIDIA GeForce GTX 1060 (NVIDIA; 30.0.15.1403) - Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz (8 Threads)

Issue description

Calling Tree.propagate_check() after an item is unchecked does not properly uncheck the parents. They are left in partially checked state.

It's easy to observe in theme editor:

godot_vLjafz08hE.mp4

Steps to reproduce

1. Edit a Theme resource
2. Go to Manage Items... menu
3. Go to Import Items tab
4. Unfold something
5. Check and uncheck a child checkbox

Minimal reproduction project

N/A

[Ymanawat]

I will work on resolving this issue.