How the undo stack caused or is affected by a text change.
public enum class UndoAction
public enum UndoAction
type UndoAction =
Public Enum UndoAction
This change will clear the undo stack.
This change will create a new undo unit.
This change will merge into the previous undo unit.
This change will not affect the undo stack at all.
This change is the result of a call to Redo()
This change is the result of a call to Undo()