Support completion condition for multi-instance

[korthout]

Is your feature request related to a problem? Please describe.

Zeebe will gain support for completion condition for multi-instance with camunda/camunda#8321. Users should be able to model this expression in the modeler, instead of having to change the XML directly.

Describe the solution you'd like

I want to be able to set the completion condition expression for multi-instance elements from the modeler's properties panel.

In the properties panel, under Multi-Instance, a new input field could be added that:

• when some text is entered, it creates the <completionCondition> element inside the <multiInstanceLoopCharacteristics> element if the completionCondition element does not yet exist, and always updates the content of the element with the provided text
• when the text is removed, it removes the <completionCondition> element from the <multiInstanceLoopCharacteristics> element.

Describe alternatives you've considered

None

Additional context

In the xml, a multi-instance element has a <multiInstanceLoopCharacteristics> child element. This multiInstanceLoopCharacteristics element should have a child element <completionCondition> which itself contains the expression as content. See BPMN/2.0.2 pages 192, 198, 432 and 433.

Zeebe expects the completion condition to be a FEEL-expression that evaluates to a boolean value.
Zeebe expects FEEL-expression to be prefixed by =.

See: bpmn-io/bpmn-js-properties-panel#530

[korthout]

@barmac Thanks for the fix. I see that this is connected to the 5.0.0-alpha release. Will that be the next generally available modeler version? Or will there be a stable release that will contain this feature?

[barmac]

The alpha is already available publicly at https://downloads.camunda.cloud/release/camunda-modeler/5.0.0-alpha.0/ Feel free to check it out and share your feedback.

[korthout]

@barmac I'm asking because of camunda/camunda-docs#509 (review). We want to publish the documentation once this feature is supported by the modeler. Is the alpha release a real release, or just something to try out stuff? If it's not stable, is there another stable release on the horizon?

[barmac]

Let's sync via DM.