Fix submenu alignment with parent menu item

scene/gui/popup_menu.cpp

@@ -204,9 +204,9 @@ void PopupMenu::_activate_submenu(int p_over, bool p_by_keyboard) {
 
 	Point2 submenu_pos;
 	if (control->is_layout_rtl()) {
-		submenu_pos = this_pos + Point2(-submenu_size.width, items[p_over]._ofs_cache + scroll_offset);
+		submenu_pos = this_pos + Point2(-submenu_size.width, items[p_over]._ofs_cache + scroll_offset - theme_cache.v_separation / 2);
 	} else {
-		submenu_pos = this_pos + Point2(this_rect.size.width, items[p_over]._ofs_cache + scroll_offset);
+		submenu_pos = this_pos + Point2(this_rect.size.width, items[p_over]._ofs_cache + scroll_offset - theme_cache.v_separation / 2);
 	}
 
 	// Fix pos if going outside parent rect.