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Merge pull request #2891 from ehuss/divide-by-zero-heading-bug

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Avoid divide-by-zero in heading nav computation
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Eric Huss 2025-10-21 00:52:17 +00:00 • committed by GitHub
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crates/mdbook-html/front-end/templates/toc.js.hbs
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@ -127,7 +127,7 @@ window.customElements.define('mdbook-sidebar-scrollbox', MDBookSidebarScrollbox)
// proportional to the difference in size. // proportional to the difference in size.
if (documentHeight < windowHeight * 2) { if (documentHeight < windowHeight * 2) {
const maxPixelsBelow = documentHeight - windowHeight; const maxPixelsBelow = documentHeight - windowHeight;
const t = 1 - pixelsBelow / maxPixelsBelow; const t = 1 - pixelsBelow / Math.max(1, maxPixelsBelow);
const clamp = Math.max(0, Math.min(1, t)); const clamp = Math.max(0, Math.min(1, t));
adjustedBottomAdd *= clamp; adjustedBottomAdd *= clamp;
} }