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Tanish MankuandClaude Opus 5
5e08aa8719
Investigating the worst file of the first 250 turned the headline finding around. bug1552113.pdf scores 84%, and the cause is Poppler: it paints the link's `/Border [0 0 112]` as a 112-unit band across a 250x50 page, hiding the two lines of text. The fixture is named "this text should be visible", and in our rendering it is. The oracle is not ground truth, and the top of its worst list needs a person to look at both images before it is read as a bug of ours. That led to a plausible change that the measurement rejected. Poppler synthesises appearances for annotations that have none, where we draw only what the document carries -- `/AP`-less link borders are already recorded as not covered under view.render-annotation-appearances -- so hiding annotations looked like the way to measure page content alone. It is worse: it then scores Poppler for every appearance we do draw. Over the same 250 files, shown gives mean 2.16%, p90 5.35% and 25 files within 0.1%; hidden gives 2.18%, 5.55% and 22, with annotation-tx3.pdf jumping to 45.64% and annotation-tx2.pdf to 18.79%. The two biases nearly cancel. So the default is unchanged and `--hide-annotations` is an opt-in for explaining a single file, with the numbers written down so the experiment is not repeated. Verified that the default reproduces the merged baseline exactly and that the flag moves it. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>