If the spline is not selected, no change.

If the spline is selected:

| Incoming Spline | !Cyclic && !Keep Shape | !Cyclic && Keep Shape | Cyclic && !Keep Shape | Cyclic && Keep Shape |
| --------------- | ------------------------- | ------------------------ | --------------------- | ------------------------- |
| **Non-Cyclic** | Non-Cyclic *(no change)* | Non-Cyclic *(no change)* | Cyclic | Non-Cyclic w/ Extra Point |
| **Cyclic** | Non-Cyclic | Non-Cyclic | Cyclic *(no change)* | Non-Cyclic w/ Extra Point |

@jacqueslucke expected behavior

| Incoming Spline | !Cyclic && !Keep Shape | !Cyclic && Keep Shape | Cyclic && !Keep Shape | Cyclic && Keep Shape |
| --------------- | ------------------------- | ------------------------ | --------------------- | ------------------------- |
| **Non-Cyclic** | Non-Cyclic *(no change)* | Non-Cyclic *(no change)* | Cyclic | Cyclic |
| **Cyclic** | Non-Cyclic | Non-Cyclic + Extra Point | Cyclic *(no change)* | Cyclic *(no change)* |