Andrey Skvortsov <andrej.skvortzov@gmail.com> [Mon, 24 Dec 2018 16:20:20 +0300] rev 2494
fix zoom-in/zoom-out using mouse wheel
regression introduced by 2393:235f847be37e "python3 support: pylint, W1619 #(old-division) division w/o __future__ statement"