[vynulldev]

What & why

On a CDJ-2000NXS2, choosing ARTIST or ALBUM in a loaded track's TRACK INFO should open that artist or album in its menu; it opened an empty menu instead.

The deck jumps by the ID carried in each Display Song Info (0x2002) row. rekordbox puts the category's ID there: the artist's ID in the artist row, the album's in the album row, and so on (link-spec Display Song Info goldens). Ours carried the track's ID in the artist and album rows and 0 in the genre and label rows, so the deck asked for an artist or album that doesn't exist. BPM and KEY jumps worked because their rows already carried real values.

• The artist, album, genre, label, key, original artist and remixer rows now carry the category's ID: rekordbox's own IDs for an imported library, otherwise the IDs the category menus list. The label row also carries the label's name, as rekordbox's does.

• The track list's original-artist detail column looked up its ID under a different name than the ORIGINAL ARTIST menu and the import, so its ID didn't match the menu's. It uses the same one now.

• After a jump the deck asks 0x3100 (rekordbox's CMD_GET_OFFSET_CONTENTID) where the loaded track sits in the list it opened, to put the cursor on it. We only ever looked IDs up in the root menu, so the answer was always 0 and the cursor sat on the first row. It now looks in the list at the request's menu location; location 7 is still the root menu, which the SHORT CUT buttons use (their requests are at location 7 in a rekordbox capture).

With the right IDs, the deck's jump sends 0x3603 (CMD_GET_DB_HIERARCHY, a position lookup we still answer generically) and then fetches the target menu itself, as it already did for BPM and KEY.

Tests check all seven category rows (failing on main) and the list offset lookup.

Conformance against rekordbox 7.2.19 is unchanged (2,304 of 4,250 exact, no case gained or lost). The Display Song Info suites still differ elsewhere (row order and other fields), so these IDs alone complete no case.

Hardware testing

• Tested on: CDJ-2000NXS2: TRACK INFO jumps to ARTIST, ALBUM, GENRE and YEAR open the right menu entries for the loaded track (ARTIST and ALBUM were empty before), and the track jump now lands the cursor on the loaded track (it sat on the first row before). SHORT CUT buttons still open their menus.

Checklist

• go build ./..., go vet ./..., and go test ./... pass
• gofmt -l . is clean
• New source files carry an SPDX header (GPL-3.0-or-later)
• Tested on real hardware (deck + firmware noted above), or this change doesn't affect deck behaviour
• I agree my contribution is licensed under the project's GPLv3