Pressing Stop Does Not Send NOTIFICATION_WM_CLOSE_REQUEST using Embedded Game Window on macOS

[stevemcilwain]

Tested versions

Tested with Godot 4.5.1.stable.

This looks similar to a previous issue fixed for Windows and Linux in 4.4 beta 1, but I believe the mac implementation is a bit different:
#101863

System information

Godot v4.5.1.stable - macOS Tahoe (26.2.0) - Multi-window, 2 monitors - Metal (Forward+) - integrated Apple M2 (Apple8) - Apple M2 (8 threads) - 24.00 GiB memory

Issue description

When writing code to intercept window close requests, the notification is never received when playing via the editor's embedded game window on macOS.

Switching to "Make Game Workspace Floating on Next Play" works as expected, the notification is received.

Steps to reproduce

Run this code in the editor on macOS using the embedded game window.
After pressing stop, nothing is logged.

Run the same code using the floating game window and the log is present.

func _notification(what: int) -> void:
     if what == NOTIFICATION_WM_CLOSE_REQUEST:
		print("WM close request received")

MRP is included.

Minimal reproduction project (MRP)

mrp-wm-close.zip

[bruvzg]

If you close it with editor Stop button, it's not sent in non embedded mode as well, Stop button kill child process. It's only sent when you press the close button in the window title.