Strip auto-retract for impossible M(IN|AX)_AUTORETRACT combo

Marlin/Marlin_main.cpp

@@ -3350,6 +3350,7 @@ inline void gcode_G0_G1(
     gcode_get_destination(); // For X Y Z E F
 
     #if ENABLED(FWRETRACT)
+      if (MIN_AUTORETRACT <= MAX_AUTORETRACT) {
         // When M209 Autoretract is enabled, convert E-only moves to firmware retract/recover moves
         if (autoretract_enabled && parser.seen('E') && !(parser.seen('X') || parser.seen('Y') || parser.seen('Z'))) {
           const float echange = destination[E_AXIS] - current_position[E_AXIS];
@@ -3360,6 +3361,7 @@ inline void gcode_G0_G1(
             return retract(echange < 0.0);                  // Firmware-based retract/recover (double-retract ignored)
           }
         }
+      }
     #endif // FWRETRACT
 
     #if IS_SCARA
@@ -8584,9 +8586,11 @@ inline void gcode_M205() {
    *   moves will be classified as retraction.
    */
   inline void gcode_M209() {
+    if (MIN_AUTORETRACT <= MAX_AUTORETRACT) {
       if (parser.seen('S')) {
         autoretract_enabled = parser.value_bool();
-      for (int i = 0; i < EXTRUDERS; i++) retracted[i] = false;
+        for (uint8_t i = 0; i < EXTRUDERS; i++) retracted[i] = false;
+      }
     }
   }
 
@@ -11051,7 +11055,7 @@ void process_next_command() {
           gcode_M208();
           break;
         case 209: // M209: Turn Automatic Retract Detection on/off
-          gcode_M209();
+          if (MIN_AUTORETRACT <= MAX_AUTORETRACT) gcode_M209();
           break;
       #endif // FWRETRACT
 

Marlin/configuration_store.cpp

@@ -1762,7 +1762,7 @@ void MarlinSettings::reset() {
 
       if (!forReplay) {
         CONFIG_ECHO_START;
-        SERIAL_ECHOLNPGM("Auto-Retract: S=0 to disable, 1 to interpret extrude-only moves as retracts or recoveries");
+        SERIAL_ECHOLNPGM("Auto-Retract: S=0 to disable, 1 to interpret E-only moves as retract/recover");
       }
       CONFIG_ECHO_START;
       SERIAL_ECHOLNPAIR("  M209 S", autoretract_enabled ? 1 : 0);