Highlights
Added F2, F3 and F4 shortcuts to show or hide Lyrics, YouTube search and Internet Radio, plus F11 to toggle the playlist.
Reworked YouTube results into a selectable thumbnail list with Play now and Add to playlist controls.
Added an option that chooses whether a genuine double-click plays a YouTube result immediately or appends it to the playlist.
Fixed playlist Up and Down navigation so it no longer seeks in mpv.
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