Bug: Edges with a target node equaling the source node should display as a loopback edge which can be selected #101
Description
Describe the bug
When an edge's sourceNode and targetNode are the same, currently the edge is rendered as a point with an arrow hanging off it. This point is not selectable, so the edge cannot be deleted.
To Reproduce
Steps to reproduce the behavior:
- Using the data, create an edge that has the same source and target node.
- Attempt to delete it.
Expected behavior
The edge should be allowed to exist (although there should be no way to create one in react-digraph)
Instead of rendering the edge as a point, make it a line that exits the source node and then returns to the source node in a different position (exit at right, return at top). Provide enough space to allow the user to select the edge for deletion.