Currently libwnck pager implements spatial navigation for the mouse wheel. Ie. wheel down selects the workspace below current, wheel up above current, wheel left the one to the left, right to right. 

In 2.x there is no spatial navigation. So wheel down selects the next workspace, wheel up the previous. (placed to the right/left usually)

While supporting 2d scrolling seems a good feature, it breaks the old behaviour. Mice with 2 scroll wheels are very rare. For one wheel mice, scroll down usually means "select next", wheel up "select previous". 

However with current 3.x libwnck, I'm not able to select the next/prev workspace by mouse wheel, cause my mouse also has only one wheel. So by wheel I can only switch workspaces in an order like 1->11->2->12->3->13 etc. 

libwnck-pager should support a property "spacial_navigation" which toggles between 1d and 2d scroll behaviour. 


Use case: 

As an xfce user, I've become very accustomed to the 2.x scroll behaviour. It's also possible to switch workspaces with mouse-wheel-over-desktop, which also works like 2.x. KDE also uses this behaviour since 3.x.  

Xfce pager has recently been ported to GTK3 where the pager shows a different scroll behaviour than wheel-over-desktop. For xfce-pager, which uses libwnck, there is no way to change the behaviour.