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Image loading (photoViewer.js) - One AbortController per open: a new open, close or unmount stops the previous photo's first and sharper downloads (an <img> by src = ''). A collapsed viewer never falls back to the original; Panoramax's flat fallback is the thumbnail. A superseded open resolves quietly. - Flat HD tracked as "loading" and "shown" apart: a discarded response no longer blocks later upgrades, and resizes while it loads ask once. - No upgrade of the photo still shown while another opens. - Size limits before decoding: imageSize.js reads JPEG/PNG/WebP/GIF headers; more than 64 MP or 16,384 px a side is refused undecoded, an <img> that decodes larger is refused and let go, flat HD needs a known width of at most 8,192 px, and panoramas always decode with a resize. Panoramax provider - Retry-After parsed as seconds or an HTTP date; the browser cannot read it here, so busy answers back off 5 s doubling to 300 s, reset once answered. - Headers timed, then the body by an idle timeout (15 s of silence), so a slow link still gets its megabyte tiles. - Cones centre only on the picture shown (onShowing), never on a late lookup; lookups nobody waits for are aborted (shared, refcounted). - onReopen: a GPU reset redraws in the viewer, not through the core. - Cones draw the home z15 tile at once and add neighbours as they arrive; a neighbour that failed is not counted as drawn. - Coverage tiles decode in ~8 ms slices (a 2 MB z10 tile over Paris was one ~85-200 ms task); sorted by measured length without a Map. - Box search asks for 20, not 100 (the API returns them nearest first). - looksLikeEmail checks every '@'; creatorOf de-duplicates with a Set. lineCoverage.js - A redraw while a swap still builds keeps what is on screen (the swap's old lines and its ready new ones) and drops only the unready ones. Tests for each (mutation-checked), two vacuous tests made real, the cones' pictures lane and readable()'s busy/timeout paths covered; the fixture's box search is nearest first. Docs: README filters and share links, CHANGELOG HD wording, CURRENT-STATE. Co-Authored-By: Claude Opus 5.5 <[email protected]>