Dealing with duplicate videos

When my collection of videos is small, I often see the same video playing in 2 or 3 panels. This looks like a bug (though it is not!). Can we instead...

when a video ends and a new one has to be selected, skip over any videos that are currently playing in another panel (ie make sure it's a unique video). Ignore this issue this if the user is swiping left or right (since they may end up picking an already-playing video that way) -- only when the system is automatically choosing the next video does this matter.
if there are not enough videos to play (eg only 4 in the entire collection after deletions), instead can we display this text in that panel:
"Add more videos to review". If the user taps that panel then open the "Add videos" window.
if a video is playing in more than one panel anyway (eg because of swiping), here's a small issue to handle: if the user favorites a video, the heart should appear on all visible versions of that video.

tedbarnett / VideoWatcher

Dealing with duplicate videos #31