| Parameter | Description |
|---|---|
| actionName | The name of the operation, which is displayed in the undo menu. |
Signals the beginning of an undoable operation.
Call this before you trigger a sequence of graph modification methods to record those operations to the undo stack.
Call Graph.UndoEndRecordGraph after the sequence to signal that the operation is complete.
Throws InvalidOperationException if there is no undo operation currently registered to the Graph.