From: Youness Alaoui <kakaroto@kakaroto.homelinux.net>
Date: Mon, 7 Dec 2015 19:58:00 +0000 (-0500)
Subject: Fix issue where a line could be sent twice due to race condition
X-Git-Tag: lulzbot-18.03~8
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=commitdiff_plain;h=fa9db4e79d9f9eb5c57195f86d043a86123f8c1a;p=cura.git

Fix issue where a line could be sent twice due to race condition
---

diff --git a/Cura/util/machineCom.py b/Cura/util/machineCom.py
index 0282fd7c..d1327d13 100644
--- a/Cura/util/machineCom.py
+++ b/Cura/util/machineCom.py
@@ -614,8 +614,9 @@ class MachineCom(object):
 		except:
 			self._log("Unexpected error: %s" % (getExceptionString()))
 		checksum = reduce(lambda x,y:x^y, map(ord, "N%d%s" % (self._gcodePos, line)))
-		self._sendCommand("N%d%s*%d" % (self._gcodePos, line, checksum))
+		pos = self._gcodePos
 		self._gcodePos += 1
+		self._sendCommand("N%d%s*%d" % (pos, line, checksum))
 		self._callback.mcProgress(self._gcodePos)
 
 	def sendCommand(self, cmd):