From 439f3e5029a69d366f9dbcd3c463b392b2c9c01d Mon Sep 17 00:00:00 2001
From: Lipu Fei <lipu.fei815@gmail.com>
Date: Thu, 27 Jul 2017 10:20:04 +0200
Subject: [PATCH] When an error check finishes, only trigger auto-slicing if
 needed

CURA-4092

Many things can trigger an error check, but Cura should only auto-slice
if the error check was scheduled due to a value change.
---
 plugins/CuraEngineBackend/CuraEngineBackend.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/plugins/CuraEngineBackend/CuraEngineBackend.py b/plugins/CuraEngineBackend/CuraEngineBackend.py
index 1573d8fa58..98f8473225 100755
--- a/plugins/CuraEngineBackend/CuraEngineBackend.py
+++ b/plugins/CuraEngineBackend/CuraEngineBackend.py
@@ -453,8 +453,9 @@ class CuraEngineBackend(QObject, Backend):
 
     def _onStackErrorCheckFinished(self):
         self._is_error_check_scheduled = False
-        self.needsSlicing()
-        self._onChanged()
+        if self._need_slicing:
+            self.needsSlicing()
+            self._onChanged()
 
     ##  Called when a sliced layer data message is received from the engine.
     #