Change playlist_new default from 4 to 10
Change src->history = playlist_new(4 /* DOCUMENT: default is max_tracks=4. */);
To src->history = playlist_new(10 /* DOCUMENT: default is max_tracks=10. */);
Other servers like Shoutcast has 10, various players and webplayers has 10. Most service providers do minimal configuration changes so a default of 10 is beneficial as that is most likely what users want anyway.
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