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feat/grid-virtualization
feedBack/tests/js
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byrongamatos d214837b0d feat(v3): DOM-virtualize the Songs grid (#636 item 3 stage 2) 
The v3 Songs grid appended every scrolled page and never released nodes,
so card-node count grew unbounded with scroll depth (24 → 624 → 2001 for a
2000-song library). Replace it with a windowed/recycled render: only the
visible window (± overscan) is in the DOM while a #v3-songs-gridsizer
element sized to ceil(total/cols)*rowH gives the scrollbar full-library
geometry; #v3-songs-grid is absolutely positioned to the first visible row.

- state.songs is a sparse, absolutely-indexed store filled a page at a time
  by ensureWindow(): the stage-1 keyset cursor for contiguous forward scroll
  (O(page)), OFFSET page= for jumps/restore/non-keyset providers. _loadPage
  shares an in-flight promise per page and an epoch guard discards a stale
  fetch that lands after a reset.
- A–Z rail seeks directly via sort_letters cumulative counts (O(1), no
  page-through); bounded scan fallback for legacy providers without it.
- Snapshot/restore is now scrollTop-based (geometry is stable). Select mode,
  accuracy badges, ⋮ menu, plugin card actions, and tree/folder coexistence
  survive cards recycling; renderWindow re-renders when select mode toggles.
- Plugins get window.v3Songs.visibleCards() + a v3:library-window-rendered
  event instead of assuming all cards are present (highway-stutter lesson).

Verified in a browser against a seeded 2001-song library: DOM bounded to
~60 nodes while the count reads "2001 songs", rail jump lands on the target
row, selection survives recycling, scroll-restore exact. Codex-reviewed
(3 findings fixed: stale-fetch epoch guard, await-in-flight page promise,
select-mode resync on cached re-entry).

Frontend-only. Tests: tests/browser/v3-grid-virtualization.spec.ts pins the
bounded-DOM invariant + direct rail jump; tests/js/v3_az_rail.test.js and
v3_songs_scroll.test.js updated to the new wiring.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-06-29 11:58:11 +02:00
..
alpha_warning_banner.test.js Clean release snapshot 2026-06-16 18:47:13 +02:00
app_tour_library.test.js Clean release snapshot 2026-06-16 18:47:13 +02:00
audio_effects_host.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
audio_effects_test_harness.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
audio_element_accessor.test.js Clean release snapshot 2026-06-16 18:47:13 +02:00
audio_session_compat.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
audio_session_host.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
audio_session_input.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
audio_session_mix.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
audio_session_monitoring.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
audio_session_routes.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
audio_session_stems_bridge.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
audio_session_stems.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
audio_session_test_harness.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
autoplay_exit.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
beats_loaded.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
capabilities_claims.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
capabilities_diagnostics.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
capabilities_lifecycle.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
capabilities_manifest_runtime.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
capabilities_multi_provider.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
capabilities_ownership.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
capabilities_test_harness.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
capabilities_versioning.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
capability_inspector_nav.test.js Clean release snapshot 2026-06-16 18:47:13 +02:00
capability_inspector_render.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
diagnostics_summary.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
edit_metadata_modal.test.js fix(library): Edit Metadata modal — editable Year + don't close on drag-release outside (#623) 2026-06-28 13:42:02 +02:00
handshapes_pipeline.test.js Clean release snapshot 2026-06-16 18:47:13 +02:00
highway_3d_arp_deferral.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
highway_3d_camera_framing.test.js Clean release snapshot 2026-06-16 18:47:13 +02:00
highway_3d_fret_label_render_order.test.js Clean release snapshot 2026-06-16 18:47:13 +02:00
highway_3d_fret_row_labels.test.js Clean release snapshot 2026-06-16 18:47:13 +02:00
highway_3d_fret_spacing.test.js fix(highway): apply 3D fret-spacing live instead of reloading (#561) (#562) 2026-06-22 12:08:22 +02:00
highway_3d_lean_sustain.test.js Clean release snapshot 2026-06-16 18:47:13 +02:00
highway_3d_lefty.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
highway_3d_overlay_full_cover.test.js fix(highway): stop stale viz frame bleeding through after switching visualizations (#565) 2026-06-22 13:27:21 +02:00
highway_3d_panel_controls.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
highway_3d_pool_warm.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
highway_3d_render_order.test.js Clean release snapshot 2026-06-16 18:47:13 +02:00
highway_3d_resize_reframe.test.js Clean release snapshot 2026-06-16 18:47:13 +02:00
highway_3d_slide_target.test.js Clean release snapshot 2026-06-16 18:47:13 +02:00
highway_3d_smooth_clock_pause.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
highway_3d_sustain_bloom.test.js Clean release snapshot 2026-06-16 18:47:13 +02:00
highway_3d_sustain_rail.test.js Clean release snapshot 2026-06-16 18:47:13 +02:00
highway_adaptive_scale.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
highway_audio_barrier.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
highway_bend_curve.test.js fix(bend): GP8 short-bend curve loss + 2D curve timing + 3D bnv gating (#535) 2026-06-21 00:46:36 +02:00
highway_chord_harmony.test.js feat(highway): render caged + guideTones teaching labels (§6.6) (#545) 2026-06-21 11:58:00 +02:00
highway_chord_render_cache.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
highway_colors_facade.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
highway_filtered_notes.test.js Clean release snapshot 2026-06-16 18:47:13 +02:00
highway_monotonic_clock.test.js Clean release snapshot 2026-06-16 18:47:13 +02:00
highway_note_state.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
highway_pause_throttle.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
highway_phrases.test.js Clean release snapshot 2026-06-16 18:47:13 +02:00
highway_renderer_swap_canvas_reset.test.js fix(highway): stop stale viz frame bleeding through after switching visualizations (#565) 2026-06-22 13:27:21 +02:00
highway_string_colors.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
highway_teaching_marks.test.js feat(highway): render teaching marks fg/ch/sd on 2D + 3D (§6.2.2) (#538) 2026-06-21 07:58:04 +02:00
highway_visibility.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
juce_engine_reroute.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
legacy_shim_hits.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
library_card_actions.test.js Purge external-format terminology from code, tests and docs 2026-06-16 19:36:53 +01:00
live_guitar_tone_source.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
live_performance_hud.test.js fix(v3): reset live performance HUD on backward seek / restart (#607) 2026-06-27 00:47:43 +02:00
loop_api.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
loop_restart.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
midi_input_domain.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
note_detection_domain.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
pedal_cables.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
play_button_reroute_guard.test.js fix(player): keep play/pause button in sync when a JUCE reroute aborts autoplay's play() (#611) 2026-06-27 13:16:28 +02:00
playback_app_adapter.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
playback_compat.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
playback_diagnostics.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
playback_domain.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
playback_test_harness.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
plugin_style_injection.test.js Clean release snapshot 2026-06-16 18:47:13 +02:00
plugins_page.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
progress_calibration.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
progression_notifications.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
progression_progress_events.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
settings_autosave.test.js Clean release snapshot 2026-06-16 18:47:13 +02:00
song_close.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
song_credits_overlay.test.js feat(highway): show feedpak author/editor credits on song load (#629) 2026-06-28 22:08:44 +02:00
song_event_payload.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
song_restart.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
song_seek.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
speed_reset.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
test_utils.js Clean release snapshot 2026-06-16 18:47:13 +02:00
tour_engine.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
tuner_auto_open.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
tuner_core.test.js Clean release snapshot 2026-06-16 18:47:13 +02:00
tuning_display.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
tuning_targets.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
v3_add_to_playlist_menu.test.js feat(v3): add "Add to playlist" to a song's ⋮ More menu (#625) 2026-06-28 13:58:14 +02:00
v3_az_rail.test.js feat(v3): DOM-virtualize the Songs grid (#636 item 3 stage 2) 2026-06-29 11:58:11 +02:00
v3_collections.test.js feat(library): smart collections as a library provider (#641) 2026-06-29 10:42:41 +02:00
v3_keep_practicing.test.js feat(v3 library): practice-aware home — Repertoire meter + "Keep practicing" shelf (#635) 2026-06-29 08:56:31 +02:00
v3_library_refresh.test.js fix(v3): refresh Songs grid after a Settings rescan / DLC-folder change (#624) 2026-06-28 13:52:48 +02:00
v3_playlist_cover.test.js feat(v3): content-dependent playlist covers + custom art (#626) 2026-06-28 14:10:15 +02:00
v3_songs_score_badge_refresh.test.js fix(v3): decode stats:recorded filename so post-play score badge refreshes (#620) 2026-06-28 12:39:13 +02:00
v3_songs_scroll.test.js feat(v3): DOM-virtualize the Songs grid (#636 item 3 stage 2) 2026-06-29 11:58:11 +02:00
v3_songs_tuning.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
venue_instrument_pov.test.js Clean release snapshot 2026-06-16 18:47:13 +02:00
venue_mood_fx.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
venue_scene_3d.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
venue_viz.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00
visualization_domain.test.js rename: slopsmith → feedBack, byron → got-feedBack (#537) 2026-06-23 11:03:01 +02:00