do not reset colors to defaults when editing overlays, ensure opacity to be a number
do not reset colors to defaults when editing overlays, ensure opacity to be a number

wellenvogel/avnav,wellenvogel/avnav,wellenvogel/avnav,wellenvogel/avnav,wellenvogel/avnav,wellenvogel/avnav,wellenvogel/avnav,wellenvogel/avnav,wellenvogel/avnav