Broken undo when changing shader globals

[KoBeWi]

Godot version

4.0 d93bec6

System information

Windows 10 x64

Issue description

When you change a shader global value in Project Settings, it creates incorrect undo state. You won't be able to undo it with Undo shortcut. History dock shows an empty entry:

When you try to go to the beginning, the editor will enter into infinite loop.

The reason why this happens is that when you change a global shader property, it will invoke a second UndoRedo action while another action is committing. This causes history inconsistency.

More details in this PR:
#68799
It fixed the immediate freeze when changing the property, but the undo history issue should be fixed too probably.

Steps to reproduce

1. Go to Project Settings -> Shader Globals
2. Add a value
3. Change it
4. Try to undo the change
5. Undoing will cause redo, so the history is stuck
6. Open History dock
7. Click The Beginning
8. 🧊

Minimal reproduction project

N/A