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I am using ido-completing-read to select songs from a database.
(song (ido-completing-read "Play: " db))
How do I use keys like C-j here to select songs in a different way. I just need to know if
the song was selected by pressing RET or C-j.
If I understand the question correctly, you could examine
last-command-eventright after callingido-completing-read: it will be10(?\n) for C-j,13(?\r) for RET.