def __init__(self, source):
        self.idx = -1
        self.source = source
        self.in_named_key = False
Update the cursor position attributes and scroll down if appropriate.
dataset/ETHPy150Open guillermooo/Vintageous/vi/keys.py/KeySequenceTokenizer.__init__--crossover with--dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/conch/insults/helper.py/TerminalBuffer.nextLine