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feat(player): drum-part picker for multiple drum charts (re-land of #1021) (#1028)
* feat(player): drum-part picker for multiple drum charts (feedpak 1.17.0)

The last mile of the multiple-drum-parts feature: let a player CHOOSE which
drum chart plays. #1020 taught the loader + highway WS to carry several drum
parts (song_info.drum_parts + ?drum_part=<id> + a part_id echo on drum_tab);
this adds the host-chrome selector that drives it.

A "Drum part" <select> sits beside the arrangement switcher in the advanced
settings popover, shown only when a song has 2+ drum charts (drum_parts is
always present — empty for non-drum songs — so single-drum / no-drum songs
hide the row and nothing changes for them). Selecting a part re-streams that
part's tab over the highway WS, exactly like an arrangement switch.

- static/highway.js:
  - reconnect() gains a third `drumPart` arg → sets `?drum_part=<id>` on the WS
    URL (mirrors the existing `arrangement` param one line up). Empty/undefined
    → the primary part, i.e. byte-identical to today for any pack untouched.
  - song_info handler populates #drum-part-select from msg.drum_parts and
    shows/hides #v3-drum-part-row on `length > 1` (parallel to the #arr-select
    block right above it).
  - drum_tab handler carries msg.part_id onto hwState.drumTab (plugins can read
    bundle.drumTab.part_id) and reflects it as the picker's selected value, so
    the dropdown stays honest even when the server resolves an unknown/absent
    selection to the primary.
- static/app.js:
  - changeArrangement() gains an optional `drumPart`; at reconnect it forwards
    the explicit part, else preserves the current picker selection — so an
    ARRANGEMENT switch keeps the chosen drum part (parts are song-level).
  - new changeDrumPart(id) delegates to changeArrangement with the current
    arrangement held + the new part applied (a part switch is the same
    re-stream, so it reuses all the transition ceremony). Exported on window.
- static/v3/index.html: the #drum-part-select row (hidden by default).

No plugin change: the drum renderers just draw whatever drum_tab streams.

RUNTIME-VERIFIED (Playwright, the core player, a 2-drum pack + a no-drum pack):
10/10 — the picker populates with both parts and shows for the multi-drum song;
song_info.drum_parts reaches getSongInfo(); the primary is pre-selected;
selecting the 2nd part drives highway.reconnect with the id and the WS URL
carries `?drum_part=drums-2`; the picker then reflects the server's part_id
echo; a no-drum song hides the row; no page errors. ESLint 0 errors (the two
max-lines warnings are pre-existing on these files). No pytest touched (JS-only).
Stacked on #1020.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017xGPjDBF8NTwTK7VQvizix
Signed-off-by: ChrisBeWithYou <christian.a.cowan@gmail.com>

* Update reconnect source contract test

---------

Signed-off-by: ChrisBeWithYou <christian.a.cowan@gmail.com>
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-07-21 15:35:08 +02:00
..
assets/venue/themes/small-club Clean release snapshot 2026-06-16 18:47:13 +02:00
capabilities Add new chart-transform plugin capability (#1000) 2026-07-19 11:27:52 +02:00
js Enable Linux nightly AppImage auto-update in the System settings UI (#999) 2026-07-19 12:16:02 +02:00
lottie rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
panes docs(panes): say which repo the desktop half lives in 2026-07-12 20:52:37 -04:00
svg Clean release snapshot 2026-06-16 18:47:13 +02:00
v3 feat(player): drum-part picker for multiple drum charts (re-land of #1021) (#1028) 2026-07-21 15:35:08 +02:00
vendor feat(highway_3d): hit-feedback juice + Hit-sparks toggle (#618) 2026-06-28 11:53:48 +02:00
_tailwind.src.css Clean release snapshot 2026-06-16 18:47:13 +02:00
app.js feat(player): drum-part picker for multiple drum charts (re-land of #1021) (#1028) 2026-07-21 15:35:08 +02:00
audio-mixer.js refactor(ui): defer every classic script, keep boot() on DOMContentLoaded (R3a) (#872) 2026-07-11 16:57:04 +02:00
capabilities.js Add new chart-transform plugin capability (#1000) 2026-07-19 11:27:52 +02:00
diagnostics.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
highway.js feat(player): drum-part picker for multiple drum charts (re-land of #1021) (#1028) 2026-07-21 15:35:08 +02:00
lottie-api.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
style.css feat(highway): show feedpak author/editor credits on song load (#629) 2026-06-28 22:08:44 +02:00
tailwind.min.css Enable Linux nightly AppImage auto-update in the System settings UI (#999) 2026-07-19 12:16:02 +02:00
tour-engine.css rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
tour-engine.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00