Broken BPMN diagram (incomplete DI) blows up editor

[nikku]

Describe the bug

Importing missing-di-plane.bpmn.txt locally breaks the editor, even after closing a tab certain operations such as click handlers stop working; I have to forcefully reload it to restore a fully working state.

The trick for this crash is to add a diagram without a BPMNDiagram#plane element as an auxiliary diagram:

  <!-- missing plane element -->
  <bpmndi:BPMNDiagram id="BPMNDiagram_2">
  </bpmndi:BPMNDiagram>

Steps to reproduce

1. Open missing-di-plane.bpmn.txt
2. See that editor blows up

Expected behavior

I expect the editor to gracefully handle such a broken diagram, give me a warning, or simple ignore the diagram (silently).

Environment

• OS: Linux
• Camunda Modeler Version: v5.23.0
• Execution Platform: Camunda 7, Camunda 8
• Installed plug-ins: none

Additional context

Potentially related reports: ref.

[nikku]

This is only partially fixed via https://github.com/bpmn-io/bpmn-js/blob/develop/CHANGELOG.md#1771, a follow-up is needed. I'm investigating.

[nikku]

Fixed upstream via bpmn-io/bpmn-js#2171, bpmn-io/bpmn-js#2172 and bpmn-io/bpmn-js#2180.

Additional fix for no-overlapping-elements lint rule: bpmn-io/bpmnlint#135, bpmn-io/bpmnlint#136.