[Opera-Linux] opera 9.52 mouse wheel scroll lines

[Andrei Lomov]

I'm working with

opera 9.52
build 2091
platform Linux
system i686, 2.6.18-std-smp-alt8
Qt lib 3.3.7
Java Runtime Environment

and have mouse wheel scrolling by 3 lines

How to set it to 1 line?

Thanks, 

-- 
Best regards,
A.L.