Now Playing: Represent currently playing video, without displaying it under erroneous filters

Currently when enabling filters while a video is playing, the currently playing video is forced into the table view to ensure it remains on screen at all times, even if you explicitly enable filters that should exclude it -- this looks particularly egregious in cases where it is forced into the wrong year, or when it appears under downloaded or favourited, lacking a flag that all other cells in the table view have.

If we feel the currently selected video should remain on screen at all times it might be worth considering a "Now Playing" pane in the main window, which could also give us the chance to evaluate whether we would want to use this location to add some of the interactions that are only displayed when the playing video has the focus of the right-hand panel, & is not playing in PiP -- for example, performing any seeking operations (start, end, back/forward 15s) or volume controls.