Toggling top-level does not update 2D editor viewport

[KoBeWi]

Godot version

4.0.2

System information

Windows 10 x64

Issue description

godot.windows.editor.dev.x86_64_uFba4bht5k.mp4

Steps to reproduce

1. Add Sprite2D
2. Toggle its top_level
3. Notice how the gizmo rectangle stays in the old position until you hover 2D editor

Minimal reproduction project

N/A

[ryevdokimov]

IMO it shouldn't move at all. Due to this bug, and because it's jarring. Especially once you start adding rotation and scale, the item could just teleport completely out of the viewport and could be difficult to find if you don't know the hotkeys.

It should, stay in place and update transform relative to global, which is what this PR for 3D is doing: #87100

[ryevdokimov]

I added two different solutions that should solve this problem depending on timeframes, compatibility, or general direction the Godot team wants to approach this. If you have time to review it, it would be appreciated.