Window.force_native forces edited scene's windows to be native in the editor

[mieldepoche]

Tested versions

• v4.3.dev.custom_build [fe01776]
• v4.3.dev5.official [c9c17d6]

System information

linux

Issue description

When enabling the force_native flag in a Window node, this window becomes native in the editor: a new os window appears...
force_native shouldn't take effect in the editor I think.

Additionally, the window correctly disappears when switching scenes but under some circumstances it can be leaked or the editor can crash:

Window duplication

• In this clip, I repeatedly toggle the force_native flag and reload the scene.

• setting the force_native flag to false and reloading the scene "disconnects" the window from the os window (the os window still hangs there):
  

• notice how moving the os window changes its properties in the inspector (at 0:06 in the clip).

simplescreenrecorder-2024-03-19_09.04.19.mp4

Crash

• if the window node spawned an os window, and then had its force_native flag set to false, and then has its visibility toggled, the editor crashes (but changing position and size works fine).

simplescreenrecorder-2024-03-19_09.24.47.mp4

Steps to reproduce

• add a Window node
• enable its force_native flag and save and reload the scene
• a new os window should spawn (which I believe is an issue)
• additionally, if you now set the flag back to false and save and reload the scene, the window should still be here

Minimal reproduction project (MRP)

any