### 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
ClassDB::bind_method(D_METHOD("scroll_to_item", "index"), &PopupMenu::scroll_to_item);
	ClassDB::bind_method(D_METHOD("remove_item", "index"), &PopupMenu::remove_item);
	ClassDB::bind_method(D_METHOD("add_separator", "label", "id"), &PopupMenu::add_separator, DEFVAL(String()), DEFVAL(-1));
	ClassDB::bind_method(D_METHOD("clear"), &PopupMenu::clear);
	ClassDB::bind_method(D_METHOD("set_hide_on_item_selection", "enable"), &PopupMenu::set_hide_on_item_selection);
	ClassDB::bind_method(D_METHOD("is_hide_on_item_selection"), &PopupMenu::is_hide_on_item_selection);
	ClassDB::bind_method(D_METHOD("set_hide_on_checkable_item_selection", "enable"), &PopupMenu::set_hide_on_checkable_item_selection);
	ClassDB::bind_method(D_METHOD("is_hide_on_checkable_item_selection"), &PopupMenu::is_hide_on_checkable_item_selection);
	ClassDB::bind_method(D_METHOD("set_hide_on_state_item_selection", "enable"), &PopupMenu::set_hide_on_multistate_item_selection);
	ClassDB::bind_method(D_METHOD("is_hide_on_state_item_selection"), &PopupMenu::is_hide_on_multistate_item_selection);
	ClassDB::bind_method(D_METHOD("set_submenu_popup_delay", "seconds"), &PopupMenu::set_submenu_popup_delay);
	ClassDB::bind_method(D_METHOD("get_submenu_popup_delay"), &PopupMenu::get_submenu_popup_delay);
	ClassDB::bind_method(D_METHOD("set_allow_search", "allow"), &PopupMenu::set_allow_search);
	ClassDB::bind_method(D_METHOD("get_allow_search"), &PopupMenu::get_allow_search);
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "hide_on_item_selection"), "set_hide_on_item_selection", "is_hide_on_item_selection");
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "hide_on_checkable_item_selection"), "set_hide_on_checkable_item_selection", "is_hide_on_checkable_item_selection");
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "hide_on_state_item_selection"), "set_hide_on_state_item_selection", "is_hide_on_state_item_selection");
	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "submenu_popup_delay", PROPERTY_HINT_NONE, "suffix:s"), "set_submenu_popup_delay", "get_submenu_popup_delay");
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "allow_search"), "set_allow_search", "get_allow_search");
	ADD_ARRAY_COUNT("Items", "item_count", "set_item_count", "get_item_count", "item_");
	ADD_SIGNAL(MethodInfo("id_pressed", PropertyInfo(Variant::INT, "id")));
	ADD_SIGNAL(MethodInfo("id_focused", PropertyInfo(Variant::INT, "id")));
	ADD_SIGNAL(MethodInfo("index_pressed", PropertyInfo(Variant::INT, "index")));
	ADD_SIGNAL(MethodInfo("menu_changed"));
	BIND_THEME_ITEM_CUSTOM(Theme::DATA_TYPE_STYLEBOX, PopupMenu, panel_style, "panel");
	BIND_THEME_ITEM_CUSTOM(Theme::DATA_TYPE_STYLEBOX, PopupMenu, hover_style, "hover");
	BIND_THEME_ITEM_CUSTOM(Theme::DATA_TYPE_STYLEBOX, PopupMenu, separator_style, "separator");
	BIND_THEME_ITEM(Theme::DATA_TYPE_STYLEBOX, PopupMenu, labeled_separator_left);
	BIND_THEME_ITEM(Theme::DATA_TYPE_STYLEBOX, PopupMenu, labeled_separator_right);
	BIND_THEME_ITEM(Theme::DATA_TYPE_CONSTANT, PopupMenu, v_separation);