Just tested the new build. Border is gone in full screen. But found something interesting.
Existing full screen used to pull focus back to the stream you just exited from. That is, the stream you exited was now focused in the leff-most larger multi display.
Now if you exist full screen, the focus stays on the stream you started full screen with. This can cause dual audio.
Rather than describe, maybe easier to replicate on an Apple TV.
- Start four streams.
- Enter full screen on any stream.
- Hit keypad right to flip to next full screen stream.
- Hit back to exit.
Notice the right-most stack of three, bottom is focused video (the one you stated with in step 2) and the stream you just exited from is the larger view on left. Audio for both streams play.
EDIT: Found hitting enter/select on remote restores focus to main left video, audio goes to normal.
Hope that description makes sense. Really enjoy the left right, flip/skip (or whatever it will be called ).