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ci: add a highlighted diff image to the Paparazzi PR comment - #221
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Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
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Before: the Paparazzi PR comment showed before and after images only.
After: a third image highlights the changed pixels in red over a faded copy of the after render. Snapshots without a before render, or whose size changed, get no diff image.
How:
.github/scripts/png-diff.jsruns pixelmatch 5.3.0 (with pngjs) in the untrusted job and stagespr-paparazzi/diff/. The comment workflow validates those PNGs like the others and adds the image. A failed diff render only warns; the comment still posts.