2.9.0 chord search issues

@HertzDevil wrote:

• The documentation claims to support arbitrary slash chords, but this really only works for inverted chords and the slash chords already supported by Hookpad (e.g. C/B but not C/B♭). This in turn causes the full spellings of those slash chords to be unsupported (e.g. Cmaj7/B doesn’t produce C/B).
• Applied V¹¹/ chords produce incorrect slash chords, even without borrowing from a different key, e.g. V¹¹/IV is B/C instead of B♭/C. It follows that chord search also uses these incorrect chords.
• Power chords (e.g. C5), omitted chords (e.g. Cno3), and thirteenth chords (e.g. Fmaj13) aren’t supported.
• Some ninth and eleventh chords cannot be searched, e.g. Bb9, probably because of ambiguity between B♭9 and B(add♭9).
• Altered chord support is very poor, and seems to cover only ♭5, ♯5, plus extensions that already appear on unaltered chords (m11b9, maj9#11). Chords with multiple extensions are unsupported.
• Certain minor chords produce ♯5 on a diminished chord but not any borrowed chords, e.g. Bm produces vii^o(♯5) rather than vii_(lyd).
• Supermodal chords on the harmonic scale are unsupported, most notably F#dim7.
• Roman numerals in chord search follow popular music rules while the actual displayed chords follow common practice rules, so things like VII in a minor key produce ♯VII. (This Hookpad 1 setting is still unavailable on 2, by the way.)
• The order of applied Roman numerals is switched (e.g. IV/V produces V/IV and vice versa).
• viio produces I instead of vii^o.
• i7dor does not actually borrow from Dorian as the documentation states.

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