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Avoid divide-by-zero in heading nav computation

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This particular value can go to zero when the document height and the
window height are exactly the same value. This causes a NaN which causes
the "current" heading nav bug to not update properly. This clamps the
value to 1 to avoid that.
This commit is contained in:
Eric Huss
2025-10-20 17:03:06 -07:00
parent 816913bd72
commit 4b5004b621
1 changed files with 1 additions and 1 deletions
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crates/mdbook-html/front-end/templates/toc.js.hbs
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@@ -132,7 +132,7 @@ window.customElements.define('mdbook-sidebar-scrollbox', MDBookSidebarScrollbox)
// proportional to the difference in size.
if (documentHeight < windowHeight * 2) {
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));
adjustedBottomAdd *= clamp;
}