From 4d4e692c8159d26713ebff7bf67b2344c74758ef Mon Sep 17 00:00:00 2001
From: InsanityAutomation
 <38436470+InsanityAutomation@users.noreply.github.com>
Date: Wed, 20 Nov 2019 00:16:43 -0500
Subject: [PATCH] Match onMeshUpdate() index sign (#15920)

---
 Marlin/src/gcode/bedlevel/abl/G29.cpp                      | 2 +-
 Marlin/src/lcd/extensible_ui/lib/lulzbot/marlin_events.cpp | 2 +-
 Marlin/src/lcd/extensible_ui/ui_api.h                      | 3 ++-
 3 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/Marlin/src/gcode/bedlevel/abl/G29.cpp b/Marlin/src/gcode/bedlevel/abl/G29.cpp
index c17150f79d..448d0d00e4 100644
--- a/Marlin/src/gcode/bedlevel/abl/G29.cpp
+++ b/Marlin/src/gcode/bedlevel/abl/G29.cpp
@@ -678,7 +678,7 @@ G29_TYPE GcodeSuite::G29() {
 
       measured_z = 0;
 
-      xy_uint8_t meshCount;
+      xy_int8_t meshCount;
 
       // Outer loop is X with PROBE_Y_FIRST enabled
       // Outer loop is Y with PROBE_Y_FIRST disabled
diff --git a/Marlin/src/lcd/extensible_ui/lib/lulzbot/marlin_events.cpp b/Marlin/src/lcd/extensible_ui/lib/lulzbot/marlin_events.cpp
index 23b37854e3..8bb2477ec5 100644
--- a/Marlin/src/lcd/extensible_ui/lib/lulzbot/marlin_events.cpp
+++ b/Marlin/src/lcd/extensible_ui/lib/lulzbot/marlin_events.cpp
@@ -127,7 +127,7 @@ namespace ExtUI {
   }
 
   #if HAS_LEVELING && HAS_MESH
-    void onMeshUpdate(const uint8_t, const uint8_t, const float) {
+    void onMeshUpdate(const int8_t, const int8_t, const float) {
     }
   #endif
 }
diff --git a/Marlin/src/lcd/extensible_ui/ui_api.h b/Marlin/src/lcd/extensible_ui/ui_api.h
index d929183949..6f852cdd87 100644
--- a/Marlin/src/lcd/extensible_ui/ui_api.h
+++ b/Marlin/src/lcd/extensible_ui/ui_api.h
@@ -138,7 +138,8 @@ namespace ExtUI {
       float getMeshPoint(const xy_uint8_t &pos);
       void setMeshPoint(const xy_uint8_t &pos, const float zval);
       void onMeshUpdate(const uint8_t xpos, const uint8_t ypos, const float zval);
-      inline void onMeshUpdate(const xy_uint8_t &pos, const float zval) { onMeshUpdate(pos.x, pos.y, zval); }
+      inline void onMeshUpdate(const int8_t xpos, const int8_t ypos, const float zval) { onMeshUpdate((uint8_t)xpos, (uint8_t)ypos, zval); }
+      inline void onMeshUpdate(const xy_int8_t &pos, const float zval) { onMeshUpdate(pos.x, pos.y, zval); }
     #endif
   #endif