Model Start->Task->End process
Extend the canvas size from the bottom by moving all nodes lower than canvas size
Create bendpoints on the sequence flows
Select all nodes by Shift+Lift Click
Move all nodes to the top
Actual Result:
Canvas will be cut above the bendpoints and it won't be possible to move it. You should to move nodes back to the bendpoints to be able to move it.
Expected Result:
Canvas will be cut till bendpoints, so it will be possible to move/delete it without any addition manipulation with other nodes.
Description
If you have a bendpoint under the node canvas will be cut by node and bendpoint will be out of the canvas, see