Update current position in M852

Marlin/Marlin_main.cpp

@@ -9914,37 +9914,47 @@ inline void gcode_M502() {
    *  K[yz_factor] - New YZ skew factor
    */
   inline void gcode_M852() {
-    const bool ijk = parser.seen('I') || parser.seen('S')
+    uint8_t ijk = 0, badval = 0, setval = 0;
-      #if ENABLED(SKEW_CORRECTION_FOR_Z)
-        || parser.seen('J') || parser.seen('K')
-      #endif
-    ;
-    bool badval = false;
 
     if (parser.seen('I') || parser.seen('S')) {
+      ++ijk;
       const float value = parser.value_linear_units();
-      if (WITHIN(value, SKEW_FACTOR_MIN, SKEW_FACTOR_MAX))
+      if (WITHIN(value, SKEW_FACTOR_MIN, SKEW_FACTOR_MAX)) {
-        planner.xy_skew_factor = value;
+        if (planner.xy_skew_factor != value) {
+          planner.xy_skew_factor = value;
+          ++setval;
+        }
+      }
       else
-        badval = true;
+        ++badval;
     }
 
     #if ENABLED(SKEW_CORRECTION_FOR_Z)
 
       if (parser.seen('J')) {
+        ++ijk;
         const float value = parser.value_linear_units();
-        if (WITHIN(value, SKEW_FACTOR_MIN, SKEW_FACTOR_MAX))
+        if (WITHIN(value, SKEW_FACTOR_MIN, SKEW_FACTOR_MAX)) {
-          planner.xz_skew_factor = value;
+          if (planner.xz_skew_factor != value) {
+            planner.xz_skew_factor = value;
+            ++setval;
+          }
+        }
         else
-          badval = true;
+          ++badval;
       }
 
       if (parser.seen('K')) {
+        ++ijk;
         const float value = parser.value_linear_units();
-        if (WITHIN(value, SKEW_FACTOR_MIN, SKEW_FACTOR_MAX))
+        if (WITHIN(value, SKEW_FACTOR_MIN, SKEW_FACTOR_MAX)) {
-          planner.yz_skew_factor = value;
+          if (planner.yz_skew_factor != value) {
+            planner.yz_skew_factor = value;
+            ++setval;
+          }
+        }
         else
-          badval = true;
+          ++badval;
       }
 
     #endif
@@ -9952,6 +9962,13 @@ inline void gcode_M502() {
     if (badval)
       SERIAL_ECHOLNPGM(MSG_SKEW_MIN " " STRINGIFY(SKEW_FACTOR_MIN) " " MSG_SKEW_MAX " " STRINGIFY(SKEW_FACTOR_MAX));
 
+    // When skew is changed the current position changes
+    if (setval) {
+      set_current_from_steppers_for_axis(ALL_AXES);
+      SYNC_PLAN_POSITION_KINEMATIC();
+      report_current_position();
+    }
+
     if (!ijk) {
       SERIAL_ECHO_START();
       SERIAL_ECHOPAIR(MSG_SKEW_FACTOR " XY: ", planner.xy_skew_factor);