private bool ProceedWithMerge(UndoTransactionImpl transaction1, UndoTransactionImpl transaction2)
{
UndoHistoryRegistryImpl registry = UndoHistoryRegistry;
return(transaction1.MergePolicy != null &&
transaction2.MergePolicy != null &&
transaction1.MergePolicy.TestCompatiblePolicy(transaction2.MergePolicy) &&
transaction1.MergePolicy.CanMerge(transaction1, transaction2));
}
public UndoHistoryImpl(UndoHistoryRegistryImpl undoHistoryRegistry)
{
this.currentTransaction = null;
this.UndoHistoryRegistry = undoHistoryRegistry;
this.undoStack = new Stack <ITextUndoTransaction>();
this.redoStack = new Stack <ITextUndoTransaction>();
this.activeUndoOperationPrimitive = null;
this.state = TextUndoHistoryState.Idle;
}