What I'm trying to achieve can be seen in this SO-Answer: https://stackoverflow.com/a/51236207/1955344
Please note the loop on the right. It groups the messages of the right outer most lane, but does not wrap around the message which is coming from the adjacent left lane, although this message is pointing in the loop.
Is this possible? I tried it, but it seems impossible to me, due to the on/off nature of groups.
I marked this question with the category "Question/help". If it is a feature that does not exist yet, please feel free to change the category to "Wanted feature".