Scroll in the sidebar

[Smiley32]

It would be nice if we could scroll the content of the nav

Now, we can scroll but if we move a bit left/right, it will move the sidebar

It would be nice if we have something like

and even like

We can scroll x or y in the nav. If we begin to scroll, this touch can't move the sidebar. We need to end the touch to move the bar :)

(A scroll event works fine to do that, but i'm not sure it works on iOS)

[lorenzodianni]

@Smiley32 yes, you are right!
Now I haven't time for work on, so PR are welcome!