Steffen Becker
b35551acd0
A pagination pass measures the DOM the last one changed, so a fresh document searched for its layout in public — 12 of them over 550ms on a two-column file, a phantom third page among them. Two real causes: the flow's overflow test had no headroom, so it read its own last answer (880px fits undecorated, 913px overflows once the decoration pins the column height), and a split dropped the height decorations without clearing their cache key. The rest is inherent to measuring rendered DOM, so the page stays hidden until its layout repeats: one visible layout instead of 12, and 21-139ms where there are no columns.