player-mpris-tail: should sort players by recency

When I'm playing Spotify and another thing, e.g. Pocket Casts web player, or YouTube, etc., there are multiple players. If I click the player-mpris-tail module to pause say currently-playing Pocket Casts, then Spotify suddenly shows up in the module. Possibly due to the formatted output by the module? But pressing unpause on my media keys again actually plays Pocket Casts again, yet clicking the module would resume Spotify playback instead.

It would be good to sort the players which have been "touched"/interacted with by recency, so that the module doesn't flip between players when interacting with it. The only thing that should change the order is by manually starting or stopping another player externally.

Thanks for your consideration.

Start at the player-mpris-tail module entry point and reproduce the behavior with Spotify plus Pocket Casts or YouTube. Trace how clicking the module and using media keys affect player ordering, then verify that interaction keeps the selected player first while externally started or stopped players can change the order.