Bug-find session 260526: info-icon survival + 1000-pt preview cap (#163)

* feat(quick-260526-pqz-01): raise preview line cap per signal from 400 -> 1000

- DashboardEngine.computePreviewEnvelopeReturning_: change min(400, ...) -> min(1000, ...) so wide windows (>=2000 px) drive proportionally more preview detail in the bottom slider strip.
- Update doc-comment on computePreviewEnvelope and inline comment in computePreviewEnvelopeReturning_ to report new range [50, 1000].
- Update consistency comment in tests/test_dashboard_preview_overlay.m (no assertion change — the test only asserts numel(xd) >= 4).
- Intentionally NOT adding cache invalidation: PreviewNBuckets_ is cached on DashboardEngine, so a running demo must restart (or trigger the existing resize-invalidation at line 2241) to pick up the new cap.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* docs(quick-260526-pqz): complete raise preview line cap quick task

- Add PLAN.md and SUMMARY.md for quick task 260526-pqz.
- Update STATE.md "Quick Tasks Completed" table with new row.

Task delivered: raised per-signal slider-preview cap from 400 -> 1000 buckets in DashboardEngine.computePreviewEnvelopeReturning_. Static analysis clean (mh_lint + mh_style); MATLAB tests pass (envelope 7/7, overlay 10/10); Octave runs as expected (preview_envelope 2/2 with pre-existing skips; preview_overlay skipped — pre-existing TimeRangeSelector guard).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* fix(dashboard): preserve i icon after PlantLog L toggle cycle

addPlantLogToggle hardcoded xPL for a 3-button right cluster, but
the FastSenseWidget chrome carries a 4-button cluster. Without a
reflowChrome_ pass after L rebuild, the recreated L button landed
on top of InfoIconButton, visually swallowing the i icon after
every toggle. The initial render was rescued by the reflowChrome_
at the end of realizeWidget; callback-driven rebuilds were not.

Fix: call DashboardLayout.reflowChrome_ at the end of
addPlantLogToggle (wrapped in try/catch so a reflow failure can
never break the toggle itself).

Adds regression tests covering one and multiple toggle cycles.
Fixes two pre-existing stale tests that pinned the 3-button-cluster
layout.

Closes debug session: .planning/debug/260526-info-icon-vanishes-after-plantlog-toggle.md

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: HanSur94

.planning/STATE.md

@@ -89,6 +89,7 @@ Other main PRs (#138, #139, #141, #144, #145, #146) auto-merged without conflict
 | 260513-sfp | Add auto-y-limit control buttons (V/A/L) to FastSenseWidget WidgetButtonBar — new YLimitMode property (auto-visible / auto-all / locked, default 'auto-visible' reproduces pre-260513-sfp behaviour), setYLimitMode public method (clears UserZoomedY on explicit click so click re-engages autoscale), autoScaleY_ refactored to dispatch on mode AFTER existing precedence guards (YLimits pin / UserZoomedY / FastSense.LiveViewMode=='follow') so 260513-ovt Follow semantics are preserved. DashboardLayout duck-types widget chrome via ismethod(widget,'setYLimitMode'), so future widgets that expose Y-rescale modes opt in without touching DashboardLayout. ASCII glyphs (V/A/L) match existing Info/Detach. reflowChrome_ re-anchors on resize. toStruct omits the default so legacy dashboards stay diff-invisible. test_fastsense_widget_ylimit_modes 11/11, test_fastsense_widget_tag 7/7, test_fastsense_follow_toggle 10/10, test_dashboard_time_sync_all_pages 5/5. Verified on live industrial-plant demo, all 8 scenarios approved. Known caveat: V/A/L cluster butts against Info button (0-px gap) — inherited from pre-existing addInfoIcon 28-px-typo, explicitly out-of-scope per plan; logged in deferred-items.md | 2026-05-13 | 4db9138, cc18c7f, a9cc181 | Verified | [260513-sfp-add-auto-y-limit-control-buttons-to-fast](./quick/260513-sfp-add-auto-y-limit-control-buttons-to-fast/) |
 | 260513-s0y | Add Tile + Close all buttons to FastSenseCompanion top toolbar — private OpenedFigures_ tracking + syncOpenedFigures_ (walks Engines_ before tile/close-all) + public trackOpenedFigure hook (InspectorPane.onOpenDetail_ and CompanionEventViewer.openEventDashboard_ forward their figure handles). tileOpenedWindows: ceil(sqrt(N))×ceil(N/cols) grid on monitor containing the companion, 24px margin, 8px gutter, row-major top-down. Before set(Position), coerces each figure to WindowState='normal' + Units='pixels' — root cause of initial "Tile does nothing" report was DashboardEngine.render defaulting to Units='normalized' (pixel rects got treated as screen fractions, pushing figures off-canvas). closeAllOpenedWindows: snapshot + close(h) per handle (honors each figure's CloseRequestFcn). Inner toolbar grid 1×4→1×6 (Events / Live / Tile / Close all / spacer / gear; gear Layout.Column 4→6). 9 sub-tests in test_companion_tile_close_buttons.m PASS; TestFastSenseCompanion regression 64/64 PASS. Verified on live industrial-plant demo. Shipped as PR #143. | 2026-05-14 | 182d6f1, 2867caa, 1be2cc8, e58bc35, c47c0c1, db9ef88 | Shipped (PR #143) | [260513-s0y-add-tile-windows-and-close-all-windows-b](./quick/260513-s0y-add-tile-windows-and-close-all-windows-b/) |
 | 260519-bs4 | Add Tag Status Table window to FastSenseCompanion — new `TagStatusTableWindow.m` (classical figure, not uifigure, per CONTEXT.md), opened via new **Tags ↗** button on companion top toolbar (col 3 in the post-merge 1×7 grid: Events / Live / Tags / Tile / Close all / spacer / gear). Detached-only window with 12-column `uitable`: Key, Name, Type, Criticality, Units, Latest, Status (smart per-type — Monitor→OK/ALARM, State→state label, others→—), Last updated (X(end) timestamp), Activity (Live/Inactive at 5-min threshold), Events (count from EventStore), Samples, Labels. All 18 demo tags listed (snapshot from `TagRegistry.find(@(t)true)`). Two parallel refresh paths: (a) push-on-write via existing `FastSenseCompanion.scanLiveTagUpdates_` → `markStatusTableDirty_(keys)` when companion is in Live mode, (b) window-owned `RefreshTimer_` (1s fixedSpacing, unique UUID name, BusyMode='drop', self-stop after 2 consecutive tick errors) so the table refreshes regardless of companion's IsLive — addresses user feedback that Activity/Last updated must stay correct when companion is idle. Pause/Resume polling toggle freezes both paths (markTagsDirty becomes a no-op while paused; header shows "Last refreshed: HH:MM:SS (paused)"). "Last refreshed" heartbeat label updates every tick. Filter chips mirror TagCatalogPane pattern: Type (Sensor/Monitor/Composite/State/Derived), Criticality (Low/Medium/High/Safety), Activity (Live/Inactive) — multi-toggle, AND-across-groups / OR-within-group; broadened free-text search across Key+Name+Units+Labels. Push-on-write hook in companion stays — both mechanisms run in parallel. Six atomic commits + 1 merge: 01 base class + 11 pure-logic tests; 02 companion wiring + 7 lifecycle tests; 03 Activity column + own timer (+5 logic + 2 lifecycle tests, deviation from "push-on-write only" CONTEXT decision per user); 04 last-refreshed header + chip filters + broader search (+4 logic + 2 lifecycle tests); 05 Pause/Resume polling toggle (+4 lifecycle tests); 06 Events count column (+4 logic + 1 lifecycle test); 07 merge with main (PR #143 toolbar grid conflict). Final test counts post-merge: `test_companion_tag_status_table` 24/24 (pure-logic), `TestTagStatusTableWindow` 16/16 (UI lifecycle), `test_companion_tile_close_buttons` 9/9 (main's new test still PASS), `TestFastSenseCompanion` 64/64 (no regression) = 113/113 total. Verified end-to-end on live industrial-plant demo: 4 MonitorTags showed real event counts (29/32/33/35), 14 others showed 0; Activity flipped Live→Inactive at exactly 5-min boundary via static buildRow_ proof; companion IsLive=0 throughout (window polled itself). Deferred / out-of-scope: (1) polling-scope clarification dismissed by user (heartbeat-only vs. passive-observation vs. only-update-changed-cells — left as-is, table updates all cells every tick); (2) Info button + markdown help — scoped up to a milestone-sized "unified in-app help/wiki" effort, parked as backlog 999.1. | 2026-05-19 | b2ed937, e8a1be5, 43d2d3b, 2a24965, 50d464c, 10df740, 73a3bf1 | Verified | [260519-bs4-implement-a-new-table-view-in-the-compan](./quick/260519-bs4-implement-a-new-table-view-in-the-compan/) |
+| 260526-pqz | Raise per-signal slider-preview cap from 400 → 1000 buckets in `DashboardEngine.computePreviewEnvelopeReturning_` — three textual edits (1 code clamp + 2 documenting comments) in `libs/Dashboard/DashboardEngine.m` plus one consistency comment in `tests/test_dashboard_preview_overlay.m` (no assertion change; `numel(xd) >= 4` is cap-independent). Edit sites: line 3524 doc-comment (`computePreviewEnvelope` range), line 3542 inline comment (clamp range), line 3555 actual clamp `max(50, min(1000, floor(axWpx / 2)))`. Out of scope per plan: cache invalidation of `PreviewNBuckets_` — running demos must restart (or trigger the existing resize-invalidation path at `DashboardEngine.m:2241`) for the new cap to take effect. Static analysis clean: `mh_lint` + `mh_style` on both edited files report "everything seems fine"; regression sweep `grep -rn "\b400\b" tests/ \| grep -iE "(preview\|bucket\|envelope)"` returns no matches. MATLAB R2025a: `test_dashboard_preview_envelope` 7/7, `test_dashboard_preview_overlay` 10/10. Octave 11.1.0: `test_dashboard_preview_envelope` 2/2 (5 skipped — pre-existing TimeRangeSelector guard for patch+FaceAlpha+NaN on xvfb), `test_dashboard_preview_overlay` skipped entirely (pre-existing). | 2026-05-26 | 834b43c | — | [260526-pqz-raise-preview-line-cap-per-signal-from-4](./quick/260526-pqz-raise-preview-line-cap-per-signal-from-4/) |
 
 ## Progress Bar