Extends a polyline using a polyline as the extender.
Esri.ArcGISRuntime (in Esri.ArcGISRuntime.dll) Version: 100.9.0
The output polyline will have the first and last segment of each path extended to the extender if the segments can be
interpolated to intersect the extender. In the case that the segments can be extended to multiple segments of the
extender, the shortest extension is chosen. Only end points for paths that are not shared by the end points of other
paths will be extended. If the polyline cannot be extended by the input extender, then a null will be returned.