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cd7a200e6c
Adds scrollFastPathStats counters to render-node-to-output.ts: captures every time a ScrollBox's DECSTBM scroll hint is generated, records whether the fast path took it (blit+shift from prevScreen) or declined, and why. Exposed through hermes-ink's public exports and snapshotted on every FrameEvent so the profiler harness can correlate decline reasons with the actual patch/renderer cost per frame. This is pure observation — no behaviour change. Preparing for the virtual-history rewrite: the hypothesis was that our topSpacer/ bottomSpacer scheme disqualifies every scroll via heightDelta mismatch, but the data shows the fast path is actually taken on most scrolls (19/23 over a 6s PageUp hold through 1100 messages) — the remaining steady-state renderer cost is Yoga tree traversal, not the per-frame full redraw I initially suspected. Declines that do happen correlate with React commits that changed the mounted range mid-scroll (heightDelta=±3 to ±35). Those are the rarer cases the virtualization rewrite still needs to address. No test diffs — instrumentation-only. Build verified: `tsc --noEmit` plus the full `npm run build` compiler post-pass pass cleanly. |
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| .. | ||
| src | ||
| ambient.d.ts | ||
| index.d.ts | ||
| index.js | ||
| package-lock.json | ||
| package.json | ||
| text-input.d.ts | ||
| text-input.js | ||