A search on the forum has not shown this feature having been requested, therefore my request. I have well found some questions related to collapsible groups ("Task Activity (Open)" and "Subprocess Activity") but nothing more.
Apparently, collapsible items currently always collapse with their upper left corner being the fixed point (or I have missed something).
In order to (manually) mitigate the impact on the overall layout of opening or closing collapsible items, I think it would be nice to be able to specify the fixed point (the "8 point" + "center" would be a good starting point).
This would allow the user to better control the impact of opening or closing the group on the connections.
Alternatively (without offering the option), setting the fixed point to the center of both shapes could be a better option, IMHO.
Any comment ? Thanks in advance