Add Z_CLEARANCE_MULTI_PROBE

Co-Authored-By: nightgryphon <ngryph@gmail.com>

Marlin/Configuration.h

  */
 #define Z_CLEARANCE_DEPLOY_PROBE   10 // Z Clearance for Deploy/Stow
 #define Z_CLEARANCE_BETWEEN_PROBES  5 // Z Clearance between probe points
+#define Z_CLEARANCE_MULTI_PROBE     5 // Z Clearance between multiple probes
 //#define Z_AFTER_PROBING           5 // Z position after probing is done
 
 #define Z_PROBE_LOW_POINT          -2 // Farthest distance below the trigger-point to go before stopping

Marlin/src/config/default/Configuration.h

  */
 #define Z_CLEARANCE_DEPLOY_PROBE   10 // Z Clearance for Deploy/Stow
 #define Z_CLEARANCE_BETWEEN_PROBES  5 // Z Clearance between probe points
+#define Z_CLEARANCE_MULTI_PROBE     5 // Z Clearance between multiple probes
 //#define Z_AFTER_PROBING           5 // Z position after probing is done
 
 #define Z_PROBE_LOW_POINT          -2 // Farthest distance below the trigger-point to go before stopping

Marlin/src/inc/Conditionals_LCD.h

  * Set flags for enabled probes
  */
 #define HAS_BED_PROBE (ENABLED(FIX_MOUNTED_PROBE) || ENABLED(Z_PROBE_ALLEN_KEY) || HAS_Z_SERVO_PROBE || ENABLED(Z_PROBE_SLED) || ENABLED(SOLENOID_PROBE))
-#define PROBE_SELECTED (HAS_BED_PROBE || ENABLED(PROBE_MANUALLY))
+#define PROBE_SELECTED (HAS_BED_PROBE || ENABLED(PROBE_MANUALLY) || ENABLED(MESH_BED_LEVELING))
 
 #if !HAS_BED_PROBE
   // Clear probe pin settings when no probe is selected

Marlin/src/inc/Conditionals_post.h

     #define Z_HOMING_HEIGHT Z_CLEARANCE_BETWEEN_PROBES
   #endif
 #endif
-#ifndef Z_CLEARANCE_BETWEEN_PROBES
-  #define Z_CLEARANCE_BETWEEN_PROBES Z_HOMING_HEIGHT
-#endif
-#if Z_CLEARANCE_BETWEEN_PROBES > Z_HOMING_HEIGHT
-  #define MANUAL_PROBE_HEIGHT Z_CLEARANCE_BETWEEN_PROBES
-#else
-  #define MANUAL_PROBE_HEIGHT Z_HOMING_HEIGHT
+
+#if PROBE_SELECTED
+  #ifndef Z_CLEARANCE_BETWEEN_PROBES
+    #define Z_CLEARANCE_BETWEEN_PROBES Z_HOMING_HEIGHT
+  #endif
+  #if Z_CLEARANCE_BETWEEN_PROBES > Z_HOMING_HEIGHT
+    #define MANUAL_PROBE_HEIGHT Z_CLEARANCE_BETWEEN_PROBES
+  #else
+    #define MANUAL_PROBE_HEIGHT Z_HOMING_HEIGHT
+  #endif
+  #ifndef Z_CLEARANCE_MULTI_PROBE
+    #define Z_CLEARANCE_MULTI_PROBE Z_CLEARANCE_BETWEEN_PROBES
+  #endif
 #endif
 
 #ifndef __SAM3X8E__ //todo: hal: broken hal encapsulation

Marlin/src/module/probe.cpp

     #endif
 
     // move up to make clearance for the probe
-    do_blocking_move_to_z(current_position[Z_AXIS] + Z_CLEARANCE_BETWEEN_PROBES, MMM_TO_MMS(Z_PROBE_SPEED_FAST));
+    do_blocking_move_to_z(current_position[Z_AXIS] + Z_CLEARANCE_MULTI_PROBE, MMM_TO_MMS(Z_PROBE_SPEED_FAST));
 
   #else
 
 
   #if MULTIPLE_PROBING > 2
       probes_total += current_position[Z_AXIS];
-      if (p > 1) do_blocking_move_to_z(current_position[Z_AXIS] + Z_CLEARANCE_BETWEEN_PROBES, MMM_TO_MMS(Z_PROBE_SPEED_FAST));
+      if (p > 1) do_blocking_move_to_z(current_position[Z_AXIS] + Z_CLEARANCE_MULTI_PROBE, MMM_TO_MMS(Z_PROBE_SPEED_FAST));
     }
   #endif