code: def focus_left(pymux):
      " Move focus to the left. "
      _move_focus(pymux,
                  lambda wp: wp.xpos - 2,  # 2 in order to skip over the border.
                  lambda wp: wp.yposf focus_left(pymux):
      " Move focus to the left. "
      _move_focus(pymux,
                  lambda wp: wp.xpos - 2,  # 2 in order to skip over the border.
                  lambda wp: wp.ypos)
docs: Move focus to the left.