batch
Helper method to batch set cards to visually read after either an up or down scroll of the feed. Since scrolls can have multiple cards scrolled off screen at a time, this method can batch set those cards to read.
Parameters
start
Where to start setting cards to viewed. The card at this index will be set to viewed. Must be less than endIndex
end
Where to end setting cards to viewed. The card at this index will be set to viewed.