I used to use my own inverted index implementation, which makes sense if
I'm searching all songs for a specific match. Instead, GTK was visiting
each track and asking "does this song match?" and this requires a
different implementation. So rather than make an index, instead I have
each track generate substrings for its tags and then I compare filter
text against the substring set.
Signed-off-by: Bryan Schumaker <bjschuma@gmail.com>
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