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Fix VCR scrubber rubber-band: hold dragPct during async fetch

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Root cause traced: mouseup sets VCR.dragging=false and starts async
fetch. Between fetch start and response (~50-200ms), the 30s interval
fires updateTimelinePlayhead() which found no matching branch for
REPLAY+old playhead, defaulting to x=cw (right edge snap).

Fix: dragPct now takes priority over buffer-based position during
REPLAY/PAUSED modes. Cleared only when fetch completes and replay
actually starts with real buffer data.
This commit is contained in:
you
2026-03-19 07:07:26 +00:00
parent be21b9ea1b
commit a64f429349
1 changed files with 5 additions and 4 deletions
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public/live.js
+5 -4
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@@ -346,14 +346,14 @@
// Redraw sparkline (cheap, avoids double-buffer complexity)
// Just draw playhead line on top — clear only the line area
let x;
if (VCR.mode === 'LIVE' || VCR.playhead < 0) {
if (VCR.mode === 'LIVE') {
x = cw; // rightmost = now
} else if (VCR.dragPct != null && (VCR.mode === 'REPLAY' || VCR.mode === 'PAUSED')) {
// After scrub: hold at drag position until replay tick updates it
x = VCR.dragPct * cw;
} else if (VCR.playhead >= 0 && VCR.playhead < VCR.buffer.length) {
const playTs = VCR.buffer[VCR.playhead].ts;
x = ((playTs - startTs) / scopeMs) * cw;
} else if (VCR.mode === 'PAUSED' && VCR.dragPct != null) {
// After scrub, hold at last drag position
x = VCR.dragPct * cw;
} else {
x = cw;
}
@@ -618,6 +618,7 @@
VCR.playhead = closest;
// Only replay ~50 packets from scrub point, not entire buffer to end
VCR.scrubEnd = Math.min(closest + 50, VCR.buffer.length);
VCR.dragPct = null; // let replay tick drive playhead now
startReplay();
})
.catch(() => {});