### 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
bool checked = arr[i + 3];
			bool disabled = arr[i + 4];
			int id = arr[i + 5];
			int accel = arr[i + 6];
			Variant meta = arr[i + 7];
			String subm = arr[i + 8];
			bool sep = arr[i + 9];
			int idx = get_item_count();
			add_item(text, id);
			set_item_icon(idx, icon);
			if (checkable) {
				if (radio_checkable) {
					set_item_as_radio_checkable(idx, true);
				} else {
					set_item_as_checkable(idx, true);
				}
			}
			set_item_checked(idx, checked);
			set_item_disabled(idx, disabled);
			set_item_id(idx, id);
			set_item_metadata(idx, meta);
			set_item_as_separator(idx, sep);
			set_item_accelerator(idx, (Key)accel);
			set_item_submenu(idx, subm);
		}
	}
#endif
	return false;
}
bool PopupMenu::_get(const StringName &p_name, Variant &r_ret) const {