Support diverging inclusive gateway

Problem you would like to solve

The diverging inclusive gateway (i.e. OR gateway) is added to Zeebe in https://github.com/camunda/zeebe/pull/9747 as an external contribution. Of course, all the Camunda Platform 8 need to be aligned and support the feature.

If the Modeler doesn’t support modeling the inclusive gateway for Camunda Platform 8, then our customers cannot use this new feature.

Proposed solution

Please support the diverging inclusive gateway for Camunda Platform 8. The behavior is specified in the PR.

At a minimum:

• a gateway can be configured to the Inclusive Gateway type
• Conditions can be configured for outgoing sequence flows of the inclusive gateway
• a Default outgoing sequence flow can be chosen for the inclusive sequence flow

Nice to have:

• validations are added for:
  • an outgoing sequence flow of an inclusive gateway doesn’t have a condition and the inclusive gateway has more than 1 outgoing sequence flow
  • there are multiple sequence flows targeting the inclusive gateway

Alternatives considered

• Customers can update the XML by hand
• Customers can use combinations of XOR and AND gateways to rebuild the OR gateway logic.

Additional context

• https://github.com/camunda/product-hub/issues/214

PS: The Camunda Cloud label should probably be updated to Camunda Platform 8

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TODO

• add inclusive gateway to replacement options (camunda-bpmn-js)
  • https://github.com/camunda/camunda-bpmn-js/pull/162
• show Condition group in properties panel if sequence flow source is inclusive gateway (bpmn-js-properties-panel)
  • https://github.com/bpmn-io/bpmn-js-properties-panel/pull/756
• add lint rules (bpmnlint-plugin-camunda-compat)
  • https://github.com/camunda/bpmnlint-plugin-camunda-compat/pull/44
  • https://github.com/camunda/linting/pull/18
    • inclusive gateway only supported in 8.1
    • inclusive gateway must not have more than one incoming sequence flow (“converging OR gateway not supported”)
    • if inclusive gateway has more than one outgoing sequence flow each must have condition (i.e. Conditions are required, unless the OR gateway is not diverging)
• integrate into Camunda Modeler
  • release bpmnlint-plugin-camunda-compat
  • release @camunda/linting
  • release bpmn-js-properties-panel
  • release camunda-bpmn-js

[philippfromme]

@nikku Yes, we can finally close this issue. 🎉

[nikku]

@korthout Added as a rule.