Code review comment for lp:~andreas-pokorny/mir/add-option-to-disable-acceleration

Looking good except:

(1) Dead code needs removing: bool enable_cursor_acceleration{true};

(2) I wonder if we can use more concise and accurate naming than libinput does?...

  MirPointerAccelerationProfile --> MirPointerAcceleration
  mir_pointer_acceleration_profile_none --> mir_pointer_acceleration_none
  mir_pointer_acceleration_profile_flat --> mir_pointer_acceleration_constant (is that accurate?)
  mir_pointer_acceleration_profile_adaptive --> mir_pointer_acceleration_adaptive