Cleanup of spacing and formatting

Marlin/Marlin_main.cpp

 
       planner.buffer_line_kinematic(destination, MMS_SCALED(fr_mm_s ? fr_mm_s : feedrate_mm_s), active_extruder);
     #endif
-    
+
     set_current_to_destination();
   }
 #endif // IS_KINEMATIC
           else {                                        // leveling from off to on
             ubl.state.active = true;                    // enable BEFORE calling unapply_leveling, otherwise ignored
             // change physical current_position to unleveled current_position without moving steppers.
-            planner.unapply_leveling(current_position); 
+            planner.unapply_leveling(current_position);
           }
         #else
           ubl.state.active = enable;                    // just flip the bit, current_position will be wrong until next move.
           (void)bilinear_z_offset(reset);
         #endif
 
+        // Enable or disable leveling compensation in the planner
         planner.abl_enabled = enable;
+
         if (!enable)
+          // When disabling just get the current position from the steppers.
+          // This will yield the smallest error when first converted back to steps.
           set_current_from_steppers_for_axis(
             #if ABL_PLANAR
               ALL_AXES
             #endif
           );
         else
+          // When enabling, remove compensation from the current position,
+          // so compensation will give the right stepper counts.
           planner.unapply_leveling(current_position);
 
-      #endif
+      #endif // ABL
     }
   }
 
 
     void set_z_fade_height(const float zfh) {
 
+      const bool level_active = leveling_is_active();
+
       #if ENABLED(AUTO_BED_LEVELING_UBL)
 
-        const bool level_active = leveling_is_active();
-        if (level_active) {
+        if (level_active)
           set_bed_leveling_enabled(false);  // turn off before changing fade height for proper apply/unapply leveling to maintain current_position
-        }
         planner.z_fade_height = zfh;
         planner.inverse_z_fade_height = RECIPROCAL(zfh);
-        if (level_active) {
+        if (level_active)
           set_bed_leveling_enabled(true);  // turn back on after changing fade height
-        }
 
       #else
 
         planner.z_fade_height = zfh;
         planner.inverse_z_fade_height = RECIPROCAL(zfh);
 
-        if (leveling_is_active()) {
+        if (level_active) {
           set_current_from_steppers_for_axis(
             #if ABL_PLANAR
               ALL_AXES
   #if HAS_CASE_LIGHT
     uint8_t args = 0;
     if (parser.seen('P')) ++args, case_light_brightness = parser.value_byte();
-    if (parser.seen('S')) ++args, case_light_on = parser.value_bool(); 
+    if (parser.seen('S')) ++args, case_light_on = parser.value_bool();
     if (args) update_case_light();
 
     // always report case light status

Marlin/example_configurations/FolgerTech-i3-2020/Configuration_adv.h

   #define PAUSE_PARK_Z_FEEDRATE 5             // Z axis feedrate in mm/s (not used for delta printers)
   #define PAUSE_PARK_RETRACT_FEEDRATE 60      // Initial retract feedrate in mm/s
   #define PAUSE_PARK_RETRACT_LENGTH 2         // Initial retract in mm
- 
+
                                               // It is a short retract used immediately after print interrupt before move to filament exchange position
   #define FILAMENT_CHANGE_UNLOAD_FEEDRATE 10  // Unload filament feedrate in mm/s - filament unloading can be fast
   #define FILAMENT_CHANGE_UNLOAD_LENGTH 100   // Unload filament length from hotend in mm

Marlin/example_configurations/M150/Configuration.h

   #define K1 0.95 //smoothing factor within the PID
 
   // If you are using a pre-configured hotend then you can use one of the value sets by uncommenting it
-  
+
   // Malyan M150 example
   #define  DEFAULT_Kp 29
   #define  DEFAULT_Ki 2

Marlin/example_configurations/M150/README.md

 # Configuration for Malyan M150 hobbyking printer
-# config without automatic bed level sensor 
-# or in other words, "as stock" 
+# config without automatic bed level sensor
+# or in other words, "as stock"

Marlin/example_configurations/gCreate_gMax1.5+/Configuration_adv.h

   #define PAUSE_PARK_Z_FEEDRATE 5             // Z axis feedrate in mm/s (not used for delta printers)
   #define PAUSE_PARK_RETRACT_FEEDRATE 60      // Initial retract feedrate in mm/s
   #define PAUSE_PARK_RETRACT_LENGTH 2         // Initial retract in mm
- 
+
                                               // It is a short retract used immediately after print interrupt before move to filament exchange position
   #define FILAMENT_CHANGE_UNLOAD_FEEDRATE 10  // Unload filament feedrate in mm/s - filament unloading can be fast
   #define FILAMENT_CHANGE_UNLOAD_LENGTH 100   // Unload filament length from hotend in mm

Marlin/pins_AZTEEG_X3.h

 //
 // Misc
 //
-#if ENABLED(CASE_LIGHT_ENABLE)  && PIN_EXISTS(CASE_LIGHT) && PIN_EXISTS(STAT_LED_RED) && STAT_LED_RED_PIN == CASE_LIGHT_PIN 
+#if ENABLED(CASE_LIGHT_ENABLE)  && PIN_EXISTS(CASE_LIGHT) && PIN_EXISTS(STAT_LED_RED) && STAT_LED_RED_PIN == CASE_LIGHT_PIN
   #undef STAT_LED_RED_PIN
 #endif
 

Marlin/pins_AZTEEG_X3_PRO.h

 //
 // Misc. Functions
 //
-#if ENABLED(CASE_LIGHT_ENABLE)  && PIN_EXISTS(CASE_LIGHT) && defined(DOGLCD_A0) && DOGLCD_A0 == CASE_LIGHT_PIN 
+#if ENABLED(CASE_LIGHT_ENABLE)  && PIN_EXISTS(CASE_LIGHT) && defined(DOGLCD_A0) && DOGLCD_A0 == CASE_LIGHT_PIN
   #undef DOGLCD_A0            // steal pin 44 for the case light; if you have a Viki2 and have connected it
   #define DOGLCD_A0      57   // following the Panucatt wiring diagram, you may need to tweak these pin assignments
                                 // as the wiring diagram uses pin 44 for DOGLCD_A0

Marlin/stepper.cpp

     /**
      * If a minimum pulse time was specified get the timer 0 value.
      *
-     * TCNT0 has an 8x prescaler, so it increments every 8 cycles. 
+     * TCNT0 has an 8x prescaler, so it increments every 8 cycles.
      * That's every 0.5µs on 16MHz and every 0.4µs on 20MHz.
      * 20 counts of TCNT0 -by itself- is a good pulse delay.
      * 10µs = 160 or 200 cycles.