So the problem disappears without following lines, but I'm not sure this is
right solution...
--- /usr/share/fvwm-crystal/fvwm/recipes/Default.orig 2016-03-20
17:28:32.000000000 +0300
+++ /usr/share/fvwm-crystal/fvwm/recipes/Default 2017-11-15
22:09:21.282534723 +0300
@@ -221,8 +221,8 @@
Style * NoIcon
# Change desktop pages using mouse wheel on pager
-Mouse (FvwmPager) 4 W $[Mod] GotoPage-Right
-Mouse (FvwmPager) 5 W $[Mod] GotoPage-Left
+#Mouse (FvwmPager) 4 W $[Mod] GotoPage-Right
+#Mouse (FvwmPager) 5 W $[Mod] GotoPage-Left
# Notification Area {{{1
# Settings of stalonetray {{{2
