[PopupMenu] Clicking any menu item triggers stream of constant WM_MOUSE enter/exit notifications

[Koyper]

Tested versions

Reproducible in 4.5 and 4.6dev2.

System information

MacOS 14.7.5

Issue description

I'm working on fixing PopupMenu issues with submenus, and had some difficulty in figuring out the source of apparently random menu item flickering, which is impeding my wrapping things up.

The source of the problem is errant notifications of NOTIFICATION_WM_MOUSE_ENTER and NOTIFICATION_WM_MOUSE_EXIT that only occurs after the first click on any menu item, disabled or not. Prior to that click the notifications work correctly. I suspect this is an issue with DisplayServer or possibly Window.

In the screen recording below, you can see the correct behavior until I go up and click the disabled menu item. Thereafter, a constant stream of enter/exits begins. It goes away after closing and reopening the menu.

Screen.Recording.2025-11-03.at.3.34.29.PM.mov

Steps to reproduce

Add the following print lines to popup_menu.cpp, then open any pulldown menu in the Editor and click any item (including any disabled item). Moving the mouse around the menu will trigger constant notifications of entering and exiting. Notice that prior to clicking an item, it works as expected with the notification being send only upon actually entering and exiting the popup.

		case NOTIFICATION_WM_MOUSE_ENTER: {
			print_line("NOTIFICATION_WM_MOUSE_ENTER", OS::get_singleton()->get_ticks_msec());
			grab_focus();
		} break;

		case NOTIFICATION_WM_MOUSE_EXIT: {
			print_line("NOTIFICATION_WM_MOUSE_EXIT", OS::get_singleton()->get_ticks_msec());
			if (mouse_over >= 0 && (!items[mouse_over].submenu || submenu_over != -1)) {
				mouse_over = -1;
				queue_accessibility_update();
				control->queue_redraw();
			}
		} break;

Minimal reproduction project (MRP)

See above.

[YeldhamDev]

I'm unable to reproduce this. The only odd thing I notice is that when the mouse leaves, it triggers the following sequence: EXIT, ENTER, and EXIT. But that happens event without clicking anything.

Do you click and drag in a certain way? Are subwindows enabled or disabled?

[Koyper]

For the screen recording, I just did a single click and lifted - no drag. It happens on all items, whether or not a submenu opens. Could be MacOS specific?

It does stop the errant behavior if you hover over a submenu and return to the parent.

[YeldhamDev]

Can you reproduce the EXIT, ENTER, and EXIT on mouse exit on your end? If not, it may be platform shenanigans.

[bruvzg]

I can reproduce it on macOS 26.