private bool ProceedWithMerge(MockTextUndoTransaction transaction1, MockTextUndoTransaction transaction2)
{
MockTextUndoHistoryRegistry registry = UndoHistoryRegistry;
return(transaction1.MergePolicy != null &&
transaction2.MergePolicy != null &&
transaction1.MergePolicy.TestCompatiblePolicy(transaction2.MergePolicy) &&
transaction1.MergePolicy.CanMerge(transaction1, transaction2));
}
public MockTextUndoHistory(MockTextUndoHistoryRegistry undoHistoryRegistry)
{
_currentTransaction = null;
UndoHistoryRegistry = undoHistoryRegistry;
_undoStack = new Stack <ITextUndoTransaction>();
_redoStack = new Stack <ITextUndoTransaction>();
_activeUndoOperationPrimitive = null;
_state = TextUndoHistoryState.Idle;
}