A function to run before an edge of the given type is relocated from its current source or target to a new
source or target. Returning false from this method will abort the move.
Type declaration
(source, target, edge): any
Parameters
source: Vertex
Candidate source. May be the edge's current source, or may be a new source.
target: Vertex
Candidate target. May be the edge's current target, or may be a new target.
A function to run before an edge of the given type is relocated from its current source or target to a new source or target. Returning false from this method will abort the move.