Doesn't work with all filetypes

[obxhdx]

I noticed that for some filetypes it doesn't work at all (e.g. tmux, conf).

For example, in any given file, if I exec set filetype=ruby, smooth scrolling works fine, but as soon as I exec set filetype=conf it stops working.

[bbrtj]

For anyone who have this issue: try setting the second argument duration to positive value if you haven't already. With 15 it works flawlessly for me in any filetype, without it there's no scrolling animation in some filetypes (mainly ones without syntax highlighting)