However this does not work (returns nullptr) when drawing with option CONT3SAMELIST.
Presumably this is a bug. Is there a possible workaround for this, since I need to be able to draw these contours with “CONT3” before creating another histogram, using the x,y coordinates of the contours.
Fixing the bug in the next ROOT release is great but there is no easy way for me to get that update with the software distribution I am required to use by my software team.
Now “LIST” option only supported for plain “CONT” draw option, any other are excluded.
Potentially, it can be done - you are welcome to submit issue on github. Also your previous problem with CONT can be submitted as separate issue.