From 2e5a3b01fd7e6a5510f0f0251d0a9cc0f63c79fb Mon Sep 17 00:00:00 2001
From: Scott Lahteine <github@thinkyhead.com>
Date: Tue, 5 Mar 2019 01:47:06 -0600
Subject: [PATCH] Save Power Loss Recovery only on move commands

---
 Marlin/src/gcode/gcode.cpp | 13 ++++++++++++-
 Marlin/src/gcode/queue.cpp |  6 +-----
 2 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/Marlin/src/gcode/gcode.cpp b/Marlin/src/gcode/gcode.cpp
index c9a699517..91d91df92 100644
--- a/Marlin/src/gcode/gcode.cpp
+++ b/Marlin/src/gcode/gcode.cpp
@@ -40,6 +40,11 @@ GcodeSuite gcode;
   #include "../feature/host_actions.h"
 #endif
 
+#if ENABLED(POWER_LOSS_RECOVERY)
+  #include "../sd/cardreader.h"
+  #include "../feature/power_loss_recovery.h"
+#endif
+
 #include "../Marlin.h" // for idle() and suspend_auto_report
 
 millis_t GcodeSuite::previous_move_ms;
@@ -86,8 +91,9 @@ int8_t GcodeSuite::get_target_extruder_from_command() {
  *  - Set the feedrate, if included
  */
 void GcodeSuite::get_destination_from_command() {
+  bool seen[XYZE] = { false, false, false, false };
   LOOP_XYZE(i) {
-    if (parser.seen(axis_codes[i])) {
+    if ( (seen[i] = parser.seenval(axis_codes[i])) ) {
       const float v = parser.value_axis_units((AxisEnum)i);
       destination[i] = (axis_relative_modes[i] || relative_mode)
         ? current_position[i] + v
@@ -97,6 +103,11 @@ void GcodeSuite::get_destination_from_command() {
       destination[i] = current_position[i];
   }
 
+  #if ENABLED(POWER_LOSS_RECOVERY)
+    // Only update power loss recovery on moves with E
+    if ((seen[E_AXIS] || seen[Z_AXIS]) && IS_SD_PRINTING()) recovery.save();
+  #endif
+
   if (parser.linearval('F') > 0)
     feedrate_mm_s = MMM_TO_MMS(parser.value_feedrate());
 
diff --git a/Marlin/src/gcode/queue.cpp b/Marlin/src/gcode/queue.cpp
index eb7f6a74c..161c3a4d0 100644
--- a/Marlin/src/gcode/queue.cpp
+++ b/Marlin/src/gcode/queue.cpp
@@ -868,12 +868,8 @@ void advance_command_queue() {
           ok_to_send();
       }
     }
-    else {
+    else
       gcode.process_next_command();
-      #if ENABLED(POWER_LOSS_RECOVERY)
-        if (IS_SD_PRINTING()) recovery.save();
-      #endif
-    }
 
   #else