Description of problem:
The first and last coordinates of a connection contained in a SubProcess or Lane are relative to that container; all other Waypoints have the correct, diagram-relative coordinates.

Version-Release number of selected component (if applicable):
6.2.0

How reproducible:
Always

Steps to Reproduce:
1. create an embedded Sub Process
2. add a Start and End event to the Sub Process
3. connect these with a Sequence Flow and insert a bendpoint in by dragging the connection

Actual results:
Examining the Process Source shows that the first and last Waypoint in the BPMNEdge DI element for the Sequence Flow are relative to the top-left corner of the embedded Sub Process, instead of being absolute (diagram-relative) coordinates.


Expected results:
All Waypoints should be diagram-relative coordinates

Additional info: