Ctrl+S does not save resources in *[unsaved] scenes

[lyuma]

Godot version:
4.0.dev c9413b513fd2fb95e9b71d886e01a04e379bb969

OS/device including version:
Windows 10.0.19041.746
Nvidia RTX 2080 Ti driver 452.06

Issue description:
Ctrl+S saves resources but only if the current scene can be saved, so either [empty] or a valid scene. (not [unsaved], and not opened .glb files or such things)

Ctrl+Alt+S (Save All Scenes) always saves resources but does not notify the user of this fact.

Similar to issue 9069, but this problem deals with all resources (such as Environment), not just scripts.

Steps to reproduce:

1. Create a new project or open existing
2. Double click default_env.tres
3. Expand Sky. Then, in the Sky fleld, click Sky to expand the sky object.
4. In the Sky Material box, create a new PhysicalSky
5. Press Ctrl-S
6. Quit to Project List and reopen.
7. The default_sky.tres was not saved.

Minimal reproduction project:
Happens in a new project

[Calinou]

Related to #45601.

[KoBeWi]

Can't reproduce in alpha7.
When scene is [empty], the resource is saved correctly.
When scene is [unsaved], you are prompted to save the scene. The resource is saved if you do so and not saved when you cancel.

So I guess the issue is resolved?

[YuriSizov]

Closing due to no response. Let me know if it's still reproduceable so I can reopen it.