Editing UI when its parent is a Window node does not show in-editor gizmos

[Swarkin]

Tested versions

Tested in 4.3.x, 4.2.x
Most likely present in any version

System information

Godot v4.3.dev4 - Windows 10.0.19044 - Vulkan (Forward+) - dedicated AMD Radeon RX 6700 XT (Advanced Micro Devices, Inc.; 31.0.24019.1006) - Intel(R) Core(TM) i5-9600K CPU @ 3.70GHz (6 Threads)

Issue description

Editor gizmos don't show:

_{I'm not sure if this has been reported already, I couldn't find anything using the Github search.}

Steps to reproduce

1. Create Window Node
2. Create child Control Node

Minimal reproduction project (MRP)

N/A

[Sauermann]

Sounds very similar to #20619, godotengine/godot-proposals#2139. Would you consider any of them a duplicate?
Also see #74573.

[Swarkin]

74573 seems to be a (partial) fix for this, I can see in one of the videos posted there gizmos showing up, but dragging them doesn't update the Window's rendered content. (See the second last video in that PR)

[KoBeWi]

This is a duplicate of #79289 (which technically is the same issue as #20619, but it was introduced when dialogs were changed to Window).