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Implements an edge style function. At the time the function is called, the result
array contains a placeholder (null) for the first absolute point,
that is, the point where the edge and source terminal are connected.
The implementation of the style then adds all intermediate waypoints
except for the last point, that is, the connection point between the
edge and the target terminal. The first ant the last point in the
result array are then replaced with mxPoints that take into account
the terminal's perimeter and next point on the edge.