Merge pull request #8523 from GMagician/2.0-Tool-change-bad-behaviour-fix

[2.0.x] Tool change bad behaviour fix

Marlin/src/module/tool_change.cpp

         SYNC_PLAN_POSITION_KINEMATIC();
 
         // Move to the "old position" (move the extruder into place)
+        #if ENABLED(SWITCHING_NOZZLE)
+          destination[Z_AXIS] += z_diff;  // Include the Z restore with the "move back"
+        #endif
         if (!no_move && IsRunning()) {
-          #if ENABLED(SWITCHING_NOZZLE)
-            if (z_raise != z_diff)
-              destination[Z_AXIS] += z_diff;  // Include the Z restore with the "move back"
-          #endif
           #if ENABLED(DEBUG_LEVELING_FEATURE)
             if (DEBUGGING(LEVELING)) DEBUG_POS("Move back", destination);
           #endif
           do_blocking_move_to(destination[X_AXIS], destination[Y_AXIS], destination[Z_AXIS]);
         }
         #if ENABLED(SWITCHING_NOZZLE)
-          // Move back down, if needed. (Including when the new tool is higher.)
-          else if (z_raise != z_diff) {
-            set_destination_from_current(); // Prevent any XY move
-            destination[Z_AXIS] += z_diff;
-            feedrate_mm_s = planner.max_feedrate_mm_s[Z_AXIS];
-            prepare_move_to_destination();
+          else {
+            // Move back down. (Including when the new tool is higher.)
+            do_blocking_move_to_z(destination[Z_AXIS], planner.max_feedrate_mm_s[Z_AXIS]);
           }
         #endif
       } // (tmp_extruder != active_extruder)