A decoder sizes an image from its header, so the row grows as soon as the
first bytes are parsed -- measured here at 421ms against a load event at
2407ms. Marking the row only once load fired left that first and largest
growth outside the compensation window, and scrolling back through history
still moved the reader by the full image height.
Rows are now marked from the moment an image mounts until loading finishes,
counted so a message with several images stays marked until the last one is
done. The listener also moves to the document: rows announce their images
while mounting, before a ref-driven listener on the timeline element would
exist to hear the first one, which is why the mount signal was being lost.
The fixture serves a real PNG and holds the response open, so the row grows
long before load the way a large image does; an SVG served in one shot lays
out and fires load together and cannot reproduce this. A companion assertion
checks the fixture still has that gap, so it cannot quietly stop testing the
timing it exists to test.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
The Electron suites were only reachable one npm script at a time, so a new
one was covered by whoever remembered it existed. test:electron:all builds
once and runs all five, reporting a single summary and a non-zero exit.
The runner lives under tests/ rather than app/scripts/, which .gitignore
excludes entirely.
The image row spacing assertion also stops hard-coding the current gap --
it had 0.59px of headroom -- and calibrates against the spacing the rest of
the timeline is using.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
The wide-image probe resolved only from a load handler that a regression
could keep from ever firing, and it was awaited bare, so a broken build
hung the run instead of reporting a failure. Every renderer probe now runs
against a deadline, the probe rejects on image error, and the suite as a
whole is bounded.
Adds a held image endpoint so an above-viewport image can be made to finish
at a moment the test controls, and asserts the reader does not move -- both
at rest and mid-gesture, which is where it regressed.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
tommy0103andClaude Opus 5
KinomotoMio