Current implementation of `cub1` does much more than it's supposed to do about gits HOT 2 CLOSED

self._cur_x = max(0, self._cur_x - 1) 
if self._cur_x == self._left_most: # we scroll up only when the cursor reaches the left most position

     def _cap_cub1(self):
         """Moves the cursor left by 1 position.
 
         Usually the method acts as a handler for a Backspace key-press.
         """
         self._cur_x = max(0, self._cur_x - 1)
 
         if self._cur_x == self._left_most:
             self._cur_x = self._right_most
             self._cur_y = max(0, self._cur_y - 1)
             self._eol = True