feature reques: toggle visability of columns (Nr, Track Name, Bus, ...) on the left side of the Arranger window.

I'd love to be able to assign a keymap to some functionality that would hide/unhide these overlapping columns. Realizing this may not be so easy to provide this feature as we're not exactly talking about a "window".

Dream scenario: Whack my Tab key and all columns on left side just go away and I see nothing but tracks... Whack Tab again to restore the view back to the previous state.