Be able to show contained (sub)process when expanding embedded sub process [Signavio Compat]

[romansmirnov]

As process modeler,

Given...

• I modeled a bpmn model in Signavio,
• so that the bpmn model contains the following aspects:
  • an embedded sub process
  • the embedded sub process contains a (sub)process
  • the embedded sub process is collapsed
• and I exported that bpmn model

When...

• I import that bpmn model in Camunda Modeler and
• I expand the embedded sub process

Then...

• then the (sub)process is displayed properly and
• re-import in Signavio is still successful (even when I change the bpmn model)

So that...

• The roundtrip between Signavio and Camunda Modeler works.

Tasks

• Integrate bpmn-js-signavio-compat with the Modeler

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Also see SUPPORT-3935