... but only for the simple search without filter operation keywords.
How would you highlight criteria that starts with NOT?
How would you highlight tracks where only a comparison of fields and other properties leads to the result?
I still see the problem of fields with a lot of data like lyrics.
Also see this thread about generally highlighting tracks/fields after applying a filter:
Nothing like the discussed pros and cons have yet led to an implementation.
I see a problem, though, if the highlighting disappears as soon as you apply a filter keyword.