Enable junction deviation by default (#15481)

config/examples/BQ/Hephestos_2/Configuration.h

@@ -757,28 +757,15 @@
 #define DEFAULT_TRAVEL_ACCELERATION   1500    // X, Y, Z acceleration for travel (non printing) moves
 
 /**
- * Junction Deviation
- *
- * Use Junction Deviation instead of traditional Jerk Limiting
- *
- * See:
- *   https://reprap.org/forum/read.php?1,739819
- *   http://blog.kyneticcnc.com/2018/10/computing-junction-deviation-for-marlin.html
- */
-//#define JUNCTION_DEVIATION
-#if ENABLED(JUNCTION_DEVIATION)
-  #define JUNCTION_DEVIATION_MM 0.02  // (mm) Distance from real junction edge
-#endif
-
-/**
- * Default Jerk (mm/s)
+ * Default Jerk limits (mm/s)
  * Override with M205 X Y Z E
  *
  * "Jerk" specifies the minimum speed change that requires acceleration.
  * When changing speed and direction, if the difference is less than the
  * value set here, it may happen instantaneously.
  */
-#if DISABLED(JUNCTION_DEVIATION)
+//#define CLASSIC_JERK
+#if ENABLED(CLASSIC_JERK)
   #define DEFAULT_XJERK  5.0
   #define DEFAULT_YJERK  5.0
   #define DEFAULT_ZJERK  0.3
@@ -791,6 +778,17 @@
 
 #define DEFAULT_EJERK   10.0  // May be used by Linear Advance
 
+/**
+ * Junction Deviation Factor
+ *
+ * See:
+ *   https://reprap.org/forum/read.php?1,739819
+ *   http://blog.kyneticcnc.com/2018/10/computing-junction-deviation-for-marlin.html
+ */
+#if DISABLED(CLASSIC_JERK)
+  #define JUNCTION_DEVIATION_MM 0.02  // (mm) Distance from real junction edge
+#endif
+
 /**
  * S-Curve Acceleration
  *