Fix for G28 disabling bed leveling comp. (T1258)

G28 was disabling bed leveling on entry, but not re-enabling it
on exit. This bug in upstream was probably not caught as G28
is most often followed by G29.

However, Cura now rehomes X/Y after pausing a print, so it is
necessary that G28 keep bed leveling information.

Marlin/Conditionals_LulzBot.h

@@ -13,7 +13,7 @@
  * got disabled.
  */
 
-#define LULZBOT_FW_VERSION ".26" // Change this with each update
+#define LULZBOT_FW_VERSION ".27" // Change this with each update
 
 #if ( \
     !defined(LULZBOT_Gladiola_Mini) && \
@@ -260,6 +260,12 @@
 // Q&A wants to be able to use M226 on endstops switches
 #define LULZBOT_NO_PIN_PROTECTION_ON_M226
 
+// Marlin 1.1.5 has an issue where bed leveling is disabled when homing,
+// this causes problems when rehoming X/Y after pausing a print.
+#if defined(LULZBOT_USE_AUTOLEVELING)
+    #define LULZBOT_G28_DISABLES_LEVELING_WORKAROUND
+#endif
+
 /******************** MOTHERBOARD AND PIN CONFIGURATION ***********************/
 
 #if defined(TOOLHEAD_Devel_ServoDual)

Marlin/Marlin_main.cpp

@@ -3940,7 +3940,7 @@ inline void gcode_G28(const bool always_home_all) {
 
   // Disable the leveling matrix before homing
   #if HAS_LEVELING
-    #if ENABLED(AUTO_BED_LEVELING_UBL)
+    #if ENABLED(AUTO_BED_LEVELING_UBL) || defined(LULZBOT_G28_DISABLES_LEVELING_WORKAROUND)
       const bool ubl_state_at_entry = leveling_is_active();
     #endif
     set_bed_leveling_enabled(false);
@@ -4093,7 +4093,7 @@ inline void gcode_G28(const bool always_home_all) {
     do_blocking_move_to_z(delta_clip_start_height);
   #endif
 
-  #if ENABLED(AUTO_BED_LEVELING_UBL)
+  #if ENABLED(AUTO_BED_LEVELING_UBL) || defined(LULZBOT_G28_DISABLES_LEVELING_WORKAROUND)
     set_bed_leveling_enabled(ubl_state_at_entry);
   #endif