virtual-core skips scroll compensation when an already-measured row above
the viewport is re-measured during an upward scroll: that is normally an
estimate correction, and compensating it makes rows jump while the reader
scrolls back through history. An image finishing loading is not an estimate
correction -- the row really did get taller -- so skipping compensation
pushed everything on screen down by the full image height. Scrolling back
through a session with screenshots moved the reader by ~490px per image.
The element now announces load and error through a composed event, and the
timeline compensates size changes for rows that just settled media while
leaving virtual-core's guard in place for every other re-measurement.
loading="lazy" comes off the image at the same time. Rows are only mounted
within a few viewports, so the attribute bought almost nothing while making
load timing depend on Chromium's connection heuristics.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
tommy0103andClaude Opus 5
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