[Therion] symbol-hide group text does not hide station text label with flag entrance

This looks like a bug, but symbol-show and symbol-hide behaviour is somewhat complicated, so maybe something I've missed. When point stations have text added to them in the survey centreline, like station O1 "Olympia Cave Main Entrance" entrance it seems that the layout statement symbol-hide group text is ineffective for these station points. All text is hidden except the text associated with stations, as specified above. This is what I want (achieved by forcing the size of all text to near-zero) This is the best I can get (without the above hack) More detail on how I got here at https://github.com/therion/therion/issues/682 Bruce