def move_left(self): 
      screen, doc = self.context()

      if not screen.start_of_line(): 
         self.move_cursor_left()

      elif screen.start_of_line() and \
           not doc.first_line() and \
           not screen.hidden_left(): 
         self.move_up()
         self.end_of_line()

      elif screen.start_of_line() and \
           screen.hidden_left(): 
         self.show_left_section()
         self.end_of_screen_line()

* * *

   def move_left(self): 
      screen, doc = self.context()

      if not screen.start_of_line(): 
         self.cursor.move_left()

      elif screen.start_of_line() and \
           not doc.first_line() and \
           not screen.hidden_left(): 
         self.screen.move_up()
         self.doc.end_of_line()

      elif screen.start_of_line() and \
           screen.hidden_left(): 
         self.screen.show_left_section()
         self.screen.end_of_line()

# [EOF]