Merge branch 'Development' into fixup_probing

Latest upstream commits

Marlin/Marlin_main.cpp

@@ -1589,7 +1589,7 @@ static void homeaxis(int axis) {
     else {
 
       if (retract_zlift > 0.01) {
-        current_position[Z_AXIS] + =retract_zlift;
+        current_position[Z_AXIS] += retract_zlift;
         #ifdef DELTA
           sync_plan_position_delta();
         #else