Method SaveUndoStart

undo/undo.go:163–168

SaveUndoStart saves the current state -- call if MustSaveUndoStart is true. Sets a special flag for this record, and action, data are empty. Does NOT increment the index, so next undo is still as expected.

(state []string)

// Sets a special flag for this record, and action, data are empty.
// Does NOT increment the index, so next undo is still as expected.
func (us *Stack) SaveUndoStart(state []string) {
	us.Mu.Lock()
	nr := &Record{UndoSave: true}
	us.Records = append(us.Records, nr)
	us.SaveState(nr, us.Index+1, state) // do it now because we need to immediately do Undo, does unlock
}

// SaveReplace replaces the current Undo record with new state,
// instead of creating a new record.  This is useful for when