Start events of nested event-subprocesses cannot be triggered

[rajgoel]

Describe the Bug

Token simulation allows to click the Play button to trigger events (message, timer, ...). In the main process, the start event of an event-subprocess can also be triggered. However, if the event-subprocess is nested within a subprocess, there is no Play button.

Steps to Reproduce

1. Create this main process

and the respective subprocess:

3. Token simulation shows the Play button only for the start event of the event-subprocess in the main process, but not for the start event of the event-subprocess in the subprocess.

Expected Behavior

The start event of the event-subprocess in the subprocess should also show.

Environment

• Host (Browser/Node version), if applicable: FF99
• OS: Ubuntu 18.04
• Library version:

 "dependencies": {
    "bpmn-js": "^9.0.3",
    "@bpmn-io/properties-panel": "^0.13.2",
    "bpmn-js-properties-panel": "^1.0.0",
    "bpmn-js-token-simulation": "^0.27.0",
    "bpmn-moddle": "^7.1.2",
    "diagram-js": "^7.x",
    "tiny-svg": "^2.2.2"
  },

[nikku]

Related to #114.

We need to catch up with the simulator on the recent nested sub-process additions.

[rajgoel]

@nikku Do you have a recommendation where to search when trying to fix this issue? I would like to help, but so-far couldn't really figure out how to track down the cause of this bug.

[nikku]

@rajgoel Sorry for leaving you hanging for so long. Just now realized your response 🙈.

If you are still eager to fix this, please consider create a test case first. That will help you to debug the tool and see where things go awry.