### Godot version

4.1.1

### System information

linux

### Issue description

![image](https://github.com/godotengine/godot-proposals/assets/71937306/04dcf0e9-1c0d-4a7f-8ca9-827dd281253a)

![image](https://github.com/godotengine/godot-proposals/assets/71937306/aa70e31e-0486-455a-b8b4-7e589ec7b754)

notice how the first option in the list is never aligned with the button that spawned it.

### Steps to reproduce

right click in the FileSystem dock and hover over the `Create New →` option.

### Minimal reproduction project

editor
for (int i = 0; i < items.size(); i++) {
		if (items[i].shortcut.is_valid()) {
			_unref_shortcut(items[i].shortcut);
		}
	}
	items.clear();
	mouse_over = -1;
	control->queue_redraw();
	child_controls_changed();
	notify_property_list_changed();
	_menu_changed();
}
void PopupMenu::_ref_shortcut(Ref<Shortcut> p_sc) {
	if (!shortcut_refcount.has(p_sc)) {
		shortcut_refcount[p_sc] = 1;
		p_sc->connect_changed(callable_mp(this, &PopupMenu::_shortcut_changed));
	} else {
		shortcut_refcount[p_sc] += 1;
	}
}
void PopupMenu::_unref_shortcut(Ref<Shortcut> p_sc) {