Stunner - Make reusable sub-process clickable with reference to linked process

Make reusable sub-process clickable with reference to linked process.

It is possible to do that in legacy designer, but not Stunner.

Expected behaviour:
Reusable sub-process will have part-of-reusable-sub-process.png of the node (reusable-sub-process.png) clickable for all:

• process designer
• process definition diagram
• process instance diagram