Dashboard Live/Follow preserve + resize/tab-switch zombie-panel fix

.planning/STATE.md

@@ -3,8 +3,8 @@ gsd_state_version: 1.0
 milestone: v3.0
 milestone_name: FastSense Companion
 status: shipped
-last_updated: "2026-05-11T14:20:05.000Z"
-last_activity: 2026-05-11 -- Quick fix 260511-n1r: delete FigureDestroyedListener_ at top of DashboardEngine.delete() — fixes R2021b CI segfault in TestDashboardDirtyFlag (listener could fire on partially-destroyed obj during MATLAB GC)
+last_updated: "2026-05-12T09:20:00.000Z"
+last_activity: 2026-05-13 -- Quick task 260513-q7w: Debounced post-resize refresh + ROOT-CAUSE ZOMBIE-PANEL FIX. After widget realization w.hPanel points to the inner content panel; rerenderWidgets was only deleting that and leaving the outer cell + WidgetButtonBar chrome alive on the canvas, stacking up zombies across multiple rerenders that painted over switched-to pages. Now deletes the outer cell (hCellPanel) properly. Canvas children stay constant at 29 across 4 rerenders + resize + tab switch.
 progress:
   total_phases: 6
   completed_phases: 2
@@ -20,7 +20,7 @@ Phase: 1028
 Plan: Not started
 Milestone: v3.0 FastSense Companion — SHIPPED 2026-04-30
 Status: Awaiting next milestone (run `/gsd:new-milestone` to scope v3.x or v4.0)
-Last activity: 2026-05-11 - Completed quick task 260511-n1r: Sever FigureDestroyedListener_ at top of DashboardEngine.delete() to prevent R2021b CI segfault — TestDashboardDirtyFlag 6/6, TestFastSenseCompanion 64/64
+Last activity: 2026-05-13 - Completed quick task 260513-q7w: Debounced two-pass post-resize refresh. Initial commit 577bf95 added the ResizeDebounceTimer + cheap update()/refresh() sweep (mirrors SliderDebounceTimer). User reported "still white at very small window sizes" — so follow-up 99c8808 made the refresh callback two-pass: pass 1 = cheap update(); pass 2 = detect any FastSenseWidget whose first line has empty XData but whose Tag has samples (the visible "white" symptom), then escalate to per-widget refresh() and, if still white, to engine-level rerenderWidgets(). Synthetic test on the live demo: forced XData=[] on a real widget's line (941→0), refreshActivePageWidgetsAfterResize_ restored it (0→941). test_dashboard_time_sync_all_pages 5/5 PASS, test_dashboard_range_selector_integration 2/2 PASS.
 
 ### Quick Tasks Completed
 
@@ -56,6 +56,14 @@ Last activity: 2026-05-11 - Completed quick task 260511-n1r: Sever FigureDestroy
 | 260511-ldu | PR #125 followup polish — extract bringFigureToFront_, tighten crosshair visibility, +2 tests, doc fixes | 2026-05-11 | 134a0d9 | — | [260511-ldu-pr-125-followup-polish-extract-bringfigu](./quick/260511-ldu-pr-125-followup-polish-extract-bringfigu/) |
 | 260511-mjb | Fix 2 pre-existing TestFastSenseCompanion failures — findobj→findall for uifigure lookup; ObjectBeingDestroyed safety-net listener on DashboardEngine.hFigure (stops LiveTimer for delete(fig)/close all force paths) | 2026-05-11 | 8df1a67 | Verified | [260511-mjb-fix-2-pre-existing-testfastsensecompanio](./quick/260511-mjb-fix-2-pre-existing-testfastsensecompanio/) |
 | 260511-n1r | Sever FigureDestroyedListener_ at top of DashboardEngine.delete() — fixes R2021b CI segfault in TestDashboardDirtyFlag (listener captured engine handle; on R2021b GC could destroy engine before its hFigure, then listener fired on deleted handle inside MATLAB's C++ dispatch layer) | 2026-05-11 | e7026bb | Verified | [260511-n1r-fix-r2021b-segfault-delete-figuredestroy](./quick/260511-n1r-fix-r2021b-segfault-delete-figuredestroy/) |
+| 260512-c5x | Fix tail-truncation artifact in FastSense MinMax downsampling — append (segX(end), segY(end)) anchor in all four cores (MEX/pure-MATLAB/log-X/slider-preview) when bucket's min/max miss segX(end). Industrial plant demo reactor.pressure tail delta 10580s→0.97s; n=2*nb+1 when anchor needed | 2026-05-12 | c932acd | Verified | [260512-c5x-fix-tail-truncation-artifact-in-fastsens](./quick/260512-c5x-fix-tail-truncation-artifact-in-fastsens/) |
+| 260512-cxc | Fix slider preview tail stuck at interior bucket midpoint (260512-c5x follow-up) — in getPreviewSeries capture anchorX before dropping the trailing point, then override xCenters(end):=anchorX so the slider tail tracks live data growth. Industrial plant demo slider-tail delta 414s→0.00s; tracks tick-for-tick after Reset | 2026-05-12 | f79642a | Verified | [260512-cxc-fix-slider-preview-tail-stuck-at-interio](./quick/260512-cxc-fix-slider-preview-tail-stuck-at-interio/) |
+| 260512-egv | Fix slider drag broken after top-toolbar Reset — add TimeRangeSelector.reinstallCallbacks + call at end of DashboardEngine.rerenderWidgets. Root cause: HoverCrosshair's chained WBM pattern unwinds in install order (not LIFO) when rerenderWidgets deletes widget panels 1..N, leaving a dangling-handle closure on the figure WBM that swallows motion events before they reach trs.onButtonMotion_. Re-installing TRS callbacks at the outermost layer restores drag. Acknowledged trade-off: per-widget HoverCrosshair goes inert until next instantiation (out-of-scope refactor) | 2026-05-12 | 7ab7584 | Verified | [260512-egv-fix-slider-drag-broken-after-reset-due-t](./quick/260512-egv-fix-slider-drag-broken-after-reset-due-t/) |
+| 260512-eu2 | Restore HoverCrosshair after Reset (260512-egv follow-up) — move TRS.reinstallCallbacks from end of rerenderWidgets to BETWEEN the delete-old-panels loop and the allocate-new-panels block. New chain post-rerender: newHcN→...→newHc1→trs.onButtonMotion_. Both slider drag AND per-widget HoverCrosshair work after Reset. Verified on live demo: POST-RESET WBM = HC's onFigureMove_, synth drag moves Selection by ~1.74 days, 2 live HoverCrosshair instances alive on active page | 2026-05-12 | dc84454 | Verified | [260512-eu2-restore-hovercrosshair-after-reset-by-mo](./quick/260512-eu2-restore-hovercrosshair-after-reset-by-mo/) |
+| 260512-fd9 | Industrial plant demo opens with Live mode OFF by default — removed `engine.startLive()` from buildDashboard.m. Both dashboard and companion now start idle (engine.IsLive=0, companion.IsLive=0); user opts in via the top-toolbar "Live" button. Aligns the two windows on the same default; data writer + LiveTagPipeline keep running independently in the background | 2026-05-12 | ac0baaa | Verified | (inline) |
+| 260512-hrn | Add Follow uitoggletool to FastSenseToolbar — between Live and Metadata — with setFollow(), syncFollowState(), IsPropagating-aware auto-disengage in FastSense.onXLimChanged, AppData stash at 4 attacher sites, and 9 function-style tests (test_fastsense_follow_toggle.m) | 2026-05-12 | 596d399, 0a4a516 | — | [260512-hrn-add-follow-toggle-button-to-fastsense-to](./quick/260512-hrn-add-follow-toggle-button-to-fastsense-to/) |
+| 260513-ovt | Preserve widget X and Y views across Live ticks + Follow toggle reaches every page — (1) added LiveViewMode='follow' guard inside FastSenseWidget.autoScaleY_, (2) removed `autoScaleY_(y)` from FastSenseWidget.refresh/update, (3) removed `broadcastTimeRange(tStart, tEnd)` from DashboardEngine.onLiveTick, (4) flipped FastSenseWidget.LiveViewMode default 'reset'→'preserve', (5) made FastSenseToolbar.syncFollowState public so FastSense.onXLimChanged's auto-disengage hook actually syncs the Follow button, (6) made DashboardEngine.{allPageWidgets,activePageWidgets} public + onFollowToggle uses allPageWidgets() so Follow actually flips every FastSenseWidget across all pages on multi-page dashboards (was silently no-op via swallowed MethodRestricted). Live mode is now strictly "append data only"; Follow does width-preserving slide with 2% right-edge gap. test_fastsense_follow_toggle 10/10, test_dashboard_time_sync_all_pages 5/5, test_dashboard_range_selector_integration 2/2; verified end-to-end on industrial plant demo (Follow ON: XLim+0.140d toward tail, width preserved exactly, 2/2 widgets switched; OFF: 2/2 reverted) | 2026-05-13 | 498a5f3, ca5be95, 8d41c48, 63cdff4 | — | [260513-ovt-when-follow-button-is-pressed-y-axis-lim](./quick/260513-ovt-when-follow-button-is-pressed-y-axis-lim/) |
+| 260513-q7w | Debounced post-resize refresh + ZOMBIE-PANEL fix that stops widgets going white during drag-resize and tab switching — TWO parallel timers on every figure resize event (300 ms cheap two-pass refresh + 1.2 s unconditional rerenderWidgets backstop). switchPage cancels both timers AND waits up to 3 s for in-flight rerenderWidgets to complete before mutating state. `IsRerendering_` flag prevents rerender-cascade scheduling. Re-entrancy guard aborts instead of self-rescheduling. **Root-cause fix**: rerenderWidgets now deletes the OUTER cell panel (via hCellPanel, falling back to hPanel for pre-realization widgets) — previous code deleted only `hPanel` which after realization points to the INNER content panel, leaving the outer cell + its WidgetButtonBar chrome alive on the canvas as "zombies" that stacked up over multiple rerenders and painted over freshly switched-to pages. test_dashboard_range_selector_integration 2/2, test_dashboard_time_sync_all_pages 5/5; canvas-children-count canary verifies zero zombie accumulation across 4 rerenders + resize + tab switch (constant 29) | 2026-05-13 | 577bf95, 99c8808, 4eda604, bc305dc, 54d5aa0, 20bcd4c | — | [260513-q7w-during-dashboard-figure-resize-fastsense](./quick/260513-q7w-during-dashboard-figure-resize-fastsense/) |
 
 ## Progress Bar