public void Replace(int offset, int length, string text)
{
if (readOnly)
{
return;
}
OnDocumentAboutToBeChanged(new DocumentEventArgs(this, offset, length, text));
undoStack.Push(new UndoableReplace(this, offset, GetText(offset, length), text));
textBufferStrategy.Replace(offset, length, text);
lineTrackingStrategy.Replace(offset, length, text);
OnDocumentChanged(new DocumentEventArgs(this, offset, length, text));
}