Merge pull request #8356 from tcm0116/2.0.x-M600

[2.0.x] Normalize load/unload length in M600

Marlin/src/module/temperature.cpp

@@ -816,6 +816,7 @@ void Temperature::manage_heater() {
       // the nominal filament diameter then square it to get an area
       const float vmroot = measurement_delay[meas_shift_index] * 0.01 + 1.0;
       planner.volumetric_multiplier[FILAMENT_SENSOR_EXTRUDER_NUM] = vmroot <= 0.1 ? 0.01 : sq(vmroot);
+      planner.refresh_e_factor(FILAMENT_SENSOR_EXTRUDER_NUM);
     }
   #endif // FILAMENT_WIDTH_SENSOR