[2.0] FWRetract Reset (Best way) (#10083)

Marlin/Configuration_adv.h

  * will be converted to firmware-based retract/recover moves.
  *
  * Note: Be sure to turn off auto-retract during filament change.
- * Note: Current status (Retract / Swap / Zlift) isn't reset by G28.
+ * Note: Current Zlift reset by G28 or G28 Z.
  *
  * Note that M207 / M208 / M209 settings are saved to EEPROM.
  *

Marlin/src/feature/fwretract.cpp

       FWRetract::retract_recover_feedrate_mm_s,      // M208 F - G11 Recover feedrate
       FWRetract::swap_retract_length,                // M207 W - G10 Swap Retract length
       FWRetract::swap_retract_recover_length,        // M208 W - G11 Swap Recover length
-      FWRetract::swap_retract_recover_feedrate_mm_s; // M208 R - G11 Swap Recover feedrate
+      FWRetract::swap_retract_recover_feedrate_mm_s, // M208 R - G11 Swap Recover feedrate
+      FWRetract::hop_amount;
 
 void FWRetract::reset() {
   autoretract_enabled = false;
   swap_retract_length = RETRACT_LENGTH_SWAP;
   swap_retract_recover_length = RETRACT_RECOVER_LENGTH_SWAP;
   swap_retract_recover_feedrate_mm_s = RETRACT_RECOVER_FEEDRATE_SWAP;
+  hop_amount = 0.0;
 
   for (uint8_t i = 0; i < EXTRUDERS; ++i) {
     retracted[i] = false;

Marlin/src/feature/fwretract.h

                retract_recover_feedrate_mm_s,      // M208 F - G11 Recover feedrate
                swap_retract_length,                // M207 W - G10 Swap Retract length
                swap_retract_recover_length,        // M208 W - G11 Swap Recover length
-               swap_retract_recover_feedrate_mm_s; // M208 R - G11 Swap Recover feedrate
+               swap_retract_recover_feedrate_mm_s, // M208 R - G11 Swap Recover feedrate
+               hop_amount;
 
   FWRetract() { reset(); }
 

Marlin/src/module/motion.cpp

     if (axis == Z_AXIS && STOW_PROBE()) return;
   #endif
 
-  // Clear retracted status if homing the Z axis
+  // Clear z_lift if homing the Z axis
   #if ENABLED(FWRETRACT)
     if (axis == Z_AXIS)
-      for (uint8_t i = 0; i < EXTRUDERS; i++) fwretract.retracted[i] = false;
+      fwretract.hop_amount = 0.0;
   #endif
 
   #if ENABLED(DEBUG_LEVELING_FEATURE)