Modeler 1.12.0 accidently created sequence flows on top of each other

[felix-mueller]

New Autoplace feature:

Reproduce:

1. Modeler a gateway
2. choose end event from context pad
3. go back to gateway and choose task from context pad
4. task is placed on top of existing sequence flow sometimes and then it creates a second sequence flow
5. now i move the task and i end up with two sequence flows going to the end event.

Happens in many different scenarios that I end up with multiple sequence flows using auto-place.

This happens a lot for participants at trainings etc.
Also see https://forum.camunda.org/t/too-many-notify-calls-for-external-task-on-executionlistener/6823

[nikku]

This issue is probably related to the fact that people use auto place + insert the placed elements into existing flows afterwards.

Could this get fixed by bpmn-io/bpmn-js#774?

[nevries]

In the attached model, select gateway and click on task in the pad. Is that what you mean, @felix-mueller ?
777.bpmn.txt

[nikku]

The later would be fixed by bpmn-io/bpmn-js#757.

[felix-mueller]

Combination of both would fix the mentioned problem I guess. Thanks @nikku

Besides this: Maybe it would be good to visualize two sequence flows on each other differently?
I dont have a specific idea at the moment how - I think colors are not a good idea.

[nikku]

I'd rather disallow the situation where two sequence flows overlap (where possible). As an example, the toolkit could make sure that two sequence flows with the same source and target are not shown as overlapping:

[benhoffmann]

I think the new task should always be placed beneath the existing sequence flow, like nikku already proposed in bpmn-io/bpmn-js#757

This would mean that you cannot insert elements directly and use auto place at the same time, but I would consider this at least a consistent behavior.

[benhoffmann]

Besides this: Maybe it would be good to visualize two sequence flows on each other differently?
I dont have a specific idea at the moment how - I think colors are not a good idea

Maybe it is already sufficient to display sequence flows always in the foreground to prevent them being hidden behind tasks or other activities?

• colors are definitely not a good option

[nikku]

The latest nightly will ensure that there won't be duplicate sequence flows anymore.

Closed via ae26472.

[nikku]

The actual fix happened here: bpmn-io/bpmn-js#774.