Clarify what are "logical" positions in the planner

Marlin/planner.cpp

@@ -1372,16 +1372,16 @@ void Planner::_set_position_mm(const float &a, const float &b, const float &c, c
 
 void Planner::set_position_mm_kinematic(const float position[NUM_AXIS]) {
   #if PLANNER_LEVELING
-    float pos[XYZ] = { position[X_AXIS], position[Y_AXIS], position[Z_AXIS] };
+    float lpos[XYZ] = { position[X_AXIS], position[Y_AXIS], position[Z_AXIS] };
-    apply_leveling(pos);
+    apply_leveling(lpos);
   #else
-    const float * const pos = position;
+    const float * const lpos = position;
   #endif
   #if IS_KINEMATIC
-    inverse_kinematics(pos);
+    inverse_kinematics(lpos);
     _set_position_mm(delta[A_AXIS], delta[B_AXIS], delta[C_AXIS], position[E_AXIS]);
   #else
-    _set_position_mm(pos[X_AXIS], pos[Y_AXIS], pos[Z_AXIS], position[E_AXIS]);
+    _set_position_mm(lpos[X_AXIS], lpos[Y_AXIS], lpos[Z_AXIS], position[E_AXIS]);
   #endif
 }
 

Marlin/planner.h

@@ -308,22 +308,22 @@ class Planner {
      * The target is cartesian, it's translated to delta/scara if
      * needed.
      *
-     *  target   - x,y,z,e CARTESIAN target in mm
+     *  ltarget  - x,y,z,e CARTESIAN target in mm
      *  fr_mm_s  - (target) speed of the move (mm/s)
      *  extruder - target extruder
      */
-    static FORCE_INLINE void buffer_line_kinematic(const float target[XYZE], const float &fr_mm_s, const uint8_t extruder) {
+    static FORCE_INLINE void buffer_line_kinematic(const float ltarget[XYZE], const float &fr_mm_s, const uint8_t extruder) {
       #if PLANNER_LEVELING
-        float pos[XYZ] = { target[X_AXIS], target[Y_AXIS], target[Z_AXIS] };
+        float lpos[XYZ] = { ltarget[X_AXIS], ltarget[Y_AXIS], ltarget[Z_AXIS] };
-        apply_leveling(pos);
+        apply_leveling(lpos);
       #else
-        const float * const pos = target;
+        const float * const lpos = ltarget;
       #endif
       #if IS_KINEMATIC
-        inverse_kinematics(pos);
+        inverse_kinematics(lpos);
-        _buffer_line(delta[A_AXIS], delta[B_AXIS], delta[C_AXIS], target[E_AXIS], fr_mm_s, extruder);
+        _buffer_line(delta[A_AXIS], delta[B_AXIS], delta[C_AXIS], ltarget[E_AXIS], fr_mm_s, extruder);
       #else
-        _buffer_line(pos[X_AXIS], pos[Y_AXIS], pos[Z_AXIS], target[E_AXIS], fr_mm_s, extruder);
+        _buffer_line(lpos[X_AXIS], lpos[Y_AXIS], lpos[Z_AXIS], ltarget[E_AXIS], fr_mm_s, extruder);
       #endif
     }