From e5ca60acf593416ebdca29d60f98c02d3fc1644c Mon Sep 17 00:00:00 2001
From: Scott Lahteine <github@thinkyhead.com>
Date: Tue, 23 Jan 2018 13:08:46 -0600
Subject: [PATCH] Patch G29 no_action for A and Q

---
 Marlin/src/gcode/bedlevel/abl/G29.cpp | 32 +++++++++++++++++----------
 1 file changed, 20 insertions(+), 12 deletions(-)

diff --git a/Marlin/src/gcode/bedlevel/abl/G29.cpp b/Marlin/src/gcode/bedlevel/abl/G29.cpp
index 88336d1e4..e4269579f 100644
--- a/Marlin/src/gcode/bedlevel/abl/G29.cpp
+++ b/Marlin/src/gcode/bedlevel/abl/G29.cpp
@@ -132,32 +132,40 @@
  */
 void GcodeSuite::G29() {
 
+  #if ENABLED(DEBUG_LEVELING_FEATURE) || ENABLED(PROBE_MANUALLY)
+    const bool seenQ = parser.seen('Q');
+  #else
+    constexpr bool seenQ = false;
+  #endif
+
   // G29 Q is also available if debugging
   #if ENABLED(DEBUG_LEVELING_FEATURE)
-    const bool query = parser.seen('Q');
     const uint8_t old_debug_flags = marlin_debug_flags;
-    if (query) marlin_debug_flags |= DEBUG_LEVELING;
+    if (seenQ) marlin_debug_flags |= DEBUG_LEVELING;
     if (DEBUGGING(LEVELING)) {
       DEBUG_POS(">>> G29", current_position);
       log_machine_info();
     }
     marlin_debug_flags = old_debug_flags;
     #if DISABLED(PROBE_MANUALLY)
-      if (query) return;
+      if (seenQ) return;
     #endif
   #endif
 
   #if ENABLED(PROBE_MANUALLY)
-    const bool seenA = parser.seen('A'), seenQ = parser.seen('Q'), no_action = seenA || seenQ;
+    const bool seenA = parser.seen('A');
+  #else
+    constexpr bool seenA = false;
   #endif
 
-  #if ENABLED(DEBUG_LEVELING_FEATURE) && DISABLED(PROBE_MANUALLY)
-    const bool faux = parser.boolval('C');
-  #elif ENABLED(PROBE_MANUALLY)
-    const bool faux = no_action;
-  #else
-    bool constexpr faux = false;
-  #endif
+  const bool  no_action = seenA || seenQ,
+              faux =
+                #if ENABLED(DEBUG_LEVELING_FEATURE) && DISABLED(PROBE_MANUALLY)
+                  parser.boolval('C')
+                #else
+                  no_action
+                #endif
+              ;
 
   // Don't allow auto-leveling without homing first
   if (axis_unhomed_error()) return;
@@ -388,7 +396,7 @@ void GcodeSuite::G29() {
 
     // Disable auto bed leveling during G29.
     // Be formal so G29 can be done successively without G28.
-    set_bed_leveling_enabled(false);
+    if (!no_action) set_bed_leveling_enabled(false);
 
     #if HAS_BED_PROBE
       // Deploy the probe. Probe will raise if needed.