Description of problem:
- It has been observed by users while they try to open a BPMN2 process definition (which was originally modelled in Web Designer) in JBDS BPMN2 Diagram Editor , it disorders layout of nodes in Swim Lane. The attached simple BPMN2 process "swimlaneProcess.bpmn2" contains a "Start Node -> Service Task -> End Node" can be imported in the JBDS projects to reproduce the issue. It appears that the round tripping of such type of process definition between the Web Designer and the JBDS Editor is causing such issues in presence of Swim Lanes as seen in this Bugzilla [1] too.

[1] https://bugzilla.redhat.com/show_bug.cgi?id=1112456

Version-Release number of selected component (if applicable):
- BPMS 6.0.2
- JBDS 7.1.1

How reproducible:
- Always with the attached "swimlaneProcess.bpmn2" process
Steps to Reproduce:
1. Import the attached "swimlaneProcess.bpmn2" process in JBDS project
2. Open it using BPMN2 Diagram Editor
3. You should see the layout is messed up
4. Try to open the same process definition in Web Designer and there it should at least open and visible properly.

Actual results:
- The process definition layout is broken.

Expected results:
- BPMN2 process layout should be properly visible in BPMN2 Diagram Editor of JBDS

Additional info:
- Nothing