Can't return to parent process from sub-process

[FlorianCassayre]

Describe the Bug

The diff of sub-processes does not work as intended, only one pane enters the sub-process. Additionally it's not possible to come out of a sub-process.

Steps to Reproduce

1. Diff a process that contains a collapsed sub-process element
2. Click on the arrow to enter that sub-process
3. => It's not possible to come back to the parent

Expected Behavior

We should be able to navigate back to the parent.

[nikku]

You refer to our demo at demo.bpmn.io/diff?

[FlorianCassayre]

You refer to our demo at demo.bpmn.io/diff?

Yes, I do.

[nikku]

Makes sense to improve this. Thanks for reporting.