keyboard navigation scrolling is broken

[DimitarChristoff]

using arrow keys to navigate the grid and scroll down is not working any more - if your '.active' cell is outside the visible view, it used to navigate('down') correctly - but it no longer does.

http://mleibman.github.io/SlickGrid/examples/example1-simple.html
vs
http://ddomingues.com/X-SlickGrid/liveDemo/examples/example1-simple.html

possibly broken because of frozen changes.

[QuangHoang]

I got the same issue when using keyboard to navigate. The navigation is working fine, but after navigating, if I use mouse to scroll up and down, the grid isn't refreshed correctly. I can replicate the issue with the link above.
http://ddomingues.com/X-SlickGrid/liveDemo/examples/example1-simple.html

[DimitarChristoff]

Found the issue. https://github.com/ddomingues/X-SlickGrid/blob/master/slick.grid.js#L3710 - this compares row to scroll to with -1 when there isn't a frozen row (say, just frozen columns).