When the track list is divided into top and bottom, let the user tab between the two halves independently -- instead of grouping them as a single focus area.
It's insanely confusing what tracks or regions etc. in either half have focus when you're moving around your project, and actions become unpredictable - for example, I'm never sure when pressing the 'delete' key what will be deleted when there are things selected in both the top and bottom list. The only way is if I remember which track list I edited/clicked in last which is hard when you're jumping around in editor windows etc.
I see this being solved by 1 of 2 options...
Solution #1: Make top and bottom track lists take focus independently. This is the suggested tab order when Divide Track List is active, and the focus rectangle should follow:
- Left Zone
- TOP Project track list
- BOTTOM Project track list
- Lower Zone
- Right Zone