diff -r 7373e3048167 -r 9deec258ab1a editors/Viewer.py
--- a/editors/Viewer.py	Fri Oct 12 12:06:45 2018 +0300
+++ b/editors/Viewer.py	Fri Oct 12 13:24:47 2018 +0300
@@ -28,6 +28,7 @@
 import math
 from time import time as gettime
 from threading import Lock
+from future.builtins import round
 
 import wx
 from six.moves import xrange