View should follow cursor horizontally

Since the Hookpad 2 editor already follows the cursor vertically while editing and playing, it makes sense to do the same horizontally, especially when line wraps are disabled.

Reposting this since the original request was probably lost on the beta thread.

Possibly related: if the piano roll has the focus (e.g. after clicking it), the left and right arrow keys would scroll the piano roll horizontally, and this is a huge disturbance when editing with the keyboard. Could that be disabled?