Make Up/Down arrow keys move cursor in multilnes input instead of cycling history

[Bedis Nbiba]

pseudo code:

handle_key_up()
 if cursor.is_at_first_line_of_input():
  cycle_history_up()
 else:
  move_cursor_up()


handle_key_down()
 if cursor.is_at_last_line_of_input():
  cycle_history_down()
 else:
  move_cursor_down()

[Bedis Nbiba]

75af740