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xarmian
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* test(e2e): the lightbox scale settles when its transform transition ends, not when two reads happen to agree (BUG-3213) settleScale accepted two equal reads of the rendered matrix as "settled". Under an 8-worker load the renderer can produce no frame between two polls, so a mid-transition scale read as final: the touch spec's pre-zoom stopped at 1.19-2.20 when it needed more than 2.3, on 11/120 runs on main and on c0819dd4^ alike. "Settled" now means no live transform CSSTransition on the viewer image, checked after flushing style. Two animation frames are awaited first: Chromium delivers touch moves aligned to frames, and without the flush the pinch oracle read one move step early (exactly 6.25px = 50px/8 in X, 17/120). The old fixpoint's polling delay had been hiding that. The zoom spec's private copy of the same fixpoint now uses the shared helper. Claude-Session: https://claude.ai/code/session_01UcaMsmoCt8u7VpJhCNxiJJ * test(e2e): settleScale awaits each transform transition's finished in the page instead of polling (BUG-3213) expect.poll's 100/250/500ms backoff, paid once per zoom step, stretched the zoom spec's 20-step zoomToMax toward its 30s budget under load. A cancelled (retargeted) transition rejects finished, so the wait loops until no transform transition is live. Claude-Session: https://claude.ai/code/session_01UcaMsmoCt8u7VpJhCNxiJJ * test(e2e): zoomToMax presses in bursts and settles once per burst, so an honest settle does not stretch its callers toward the timeout (BUG-3213) Each '+' computes from the viewer's zoom state, so a burst of four lands exactly four steps; settleScale waits for the transition to end, so a burst that does not climb is the clamp. Measured x40 at 8 workers (p50/max): controls-at-max 14.1/15.6 on main -> 9.7/12.9, pan-clamp 17.2/19.6 -> 14.2/18.7, resize-clamp 15.2/19.5 -> 11.6/17.2. Claude-Session: https://claude.ai/code/session_01UcaMsmoCt8u7VpJhCNxiJJ