Godot-4.4-rc1: window_set_mode ends with error Embedded window only supports Windowed mode.

[MikeSchulze]

Tested versions

v4.4.rc1.mono.official [8ed125b]

System information

Windows 11

Issue description

After upgrading to v4.4.rc1.mono.official [8ed125b] my test runner scene is broken.
It shows an error

E 0:00:01:135   GdUnitBaseTestRunner.gd:59 @ _init(): Embedded window only supports Windowed mode.
  <C++ Error>   Condition "p_mode != WINDOW_MODE_WINDOWED && wd.parent_hwnd" is true.
  <C++ Source>  platform/windows/display_server_windows.cpp:2348 @ window_set_mode()
  <Stack Trace> GdUnitBaseTestRunner.gd:59 @ _init()
                GdUnitTestRunner.gd:17 @ _init()

Steps to reproduce

Create a scene and run it by using

EditorInterface.play_custom_scene("res://addons/gdUnit4/src/core/runners/GdUnitTestRunner.tscn")

extends Node


func _init() -> void:
	# minimize scene window checked debug mode
	if OS.get_cmdline_args().size() == 1:
		DisplayServer.window_set_title("GdUnit4 Runner (Debug Mode)")
	else:
		DisplayServer.window_set_title("GdUnit4 Runner (Release Mode)")


	DisplayServer.window_set_mode(DisplayServer.WINDOW_MODE_MINIMIZED)

Minimal reproduction project (MRP)

n/a

[xDovos]

can confirm. also all functions related to moving the main game window are broken too like
get_window().move_to_center()
or
get_window().position = Vector2(10,10)
related issue: #101357

[Hilderin]

Currently, moving or changing window mode is not supported when embedding is enabled. You can check in code if your game is embedded or not using Engine.is_embedded_in_editor(). It's explained in more details here: #99010

If you want to go back to the non embedded behaviour to manually set the game window settings from the code, you can disable the embedding from the Game View. Uncheck "Embed Game on Next Play":

[MikeSchulze]

Currently, moving or changing window mode is not supported when embedding is enabled. You can check in code if your game is embedded or not using Engine.is_embedded_in_editor(). It's explained in more details here: #99010

If you want to go back to the non embedded behaviour to manually set the game window settings from the code, you can disable the embedding from the Game View. Uncheck "Embed Game on Next Play":

Manually disable will not work for my use case.
I use a scene as a test runner, and I want to be minimized by default when is running.

This is a regression, it should be work as before.