My bet is that since GTK3 applications use smooth scrolling (http://who-t.blogspot.de/2011/09/whats-new-in-xi-21-smooth-scrolling.html), they listen to different scroll events than the (correctly-inverted) GTK2-based ones.
My bet is that since GTK3 applications use smooth scrolling (http:// who-t.blogspot. de/2011/ 09/whats- new-in- xi-21-smooth- scrolling. html), they listen to different scroll events than the (correctly- inverted) GTK2-based ones.