Implement --no-window option for macOS and Linux

[MikeSchulze]

Godot version:
Godot Engine v3.2.3.stable.mono.official

OS/device including version:
macOS Sierra Version 10.12.6

Issue description:
When i try to run a script via OS.execute() with option --no-window the window pops up.
Under Windows 10 it works as expected but under MacOs the window is not hidden

Steps to reproduce:

class_name GdUnitRunnerClient
extends SceneTree

func _initialize():
  pass
...

execution from a EditorPlugin context

var arguments := Array()
arguments.append("--no-window")
arguments.append("-d")
arguments.append("-s")
arguments.append("res://addons/gdUnit/src/core/GdUnitRunnerClient.gd")

var output = []
_current_runner_process_id = OS.execute(OS.get_executable_path(), arguments, false, output, true);

Minimal reproduction project:

[bruvzg]

On Linux and macOS --no-window is not implemented, here's PR for it #42276.

[akien-mga]

$ godot --help | grep no-window
  --no-window                      Disable window creation (Windows only). Useful together with --script.

[MikeSchulze]

ok thanks for this feedback

[akien-mga]

Let's repurpose this as a feature request to implement --no-window for macOS and Linux I guess, which #42276 can close.

[Riteo]

Now that the resolving PR has been merged, can this issue be closed?

[Calinou]

Closing, as this is now implemented in 3.2 (it will be in 3.2.4beta2).