code: def _is_paste(keys):
          
          # Consider paste when it contains at least one newline and at least one
          # other character.
          text_count = 0
          newline_count = 0
  
          for k in keys:
              if isinstance(k.key, six.text_type):
                  text_count += 1
              if k.key == Keys.ControlJ:
                  newline_count += 1
  
          return newline_count >= 1 and text_count > 1
docs: Return `True` when we should consider this list of keys as a paste
          event. Pasted text on windows will be turned into a
          `Keys.BracketedPaste` event. (It's not 100% correct, but it is probably
          the best possible way to detect pasting of text and handle that
          correctly.)