fix (react-dialog): Use consistent rounding for clientHeight and innerHeight#32480
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emmayjiang merged 2 commits intomicrosoft:masterfrom Sep 10, 2024
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packages/react-components/react-dialog/library/src/utils/useDisableBodyScroll.ts
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LGTM ✅ I'm not a big fan of the extra style recalc that this introduces but I believe it is unavoidable if we want to fix #32481
Thanks for the PR @CampbellOwen 💪🏻
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* master: (77 commits) fix(react-drawer): update scroll state when children changes (microsoft#32818) feat(react-storybook-addon): improve addon to more readable names (microsoft#32815) chore: cleanup react-carousel-preview (microsoft#32475) feat(storybook): add rtl/ltr toggle storybook addon (microsoft#32814) Carousel: Storybook updates and fixing exports/focus (microsoft#32457) release: applying package updates - react v8 release: applying package updates - web-components Update d3 dependency versions to 3.x.x and 4.x.x (microsoft#32463) RFC: Extended Design Tokens for Fluent UI React (microsoft#32058) update doc to reflect setTheme function change (microsoft#32490) fix (react-dialog): Use consistent rounding for clientHeight and innerHeight (microsoft#32480) fix(public-doscite-v9): global styles should not be applied to story elements (microsoft#32472) feat(workspace-plugin): implement verify-packaging executor (microsoft#32403) release: applying package updates - react-components Add strokeDasharray property when optimizeLargeData is true (microsoft#32494) fix(TreeItemLayout): Actions should not unmount between successive mouse events (microsoft#32477) release: applying package updates - react v8 bugfix(react-tree): recover from tabIndex=-1 when TreeItem is removed (microsoft#32442) Fix onResolveSuggestions not being called after component is remounted in react 18 strict mode (microsoft#28227) fix(codeowners): update most packages owned by cxe-red with cxe-prg (microsoft#32445) ...
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Previous Behavior
When calculating whether scrollbars are present, we compare the body's clientHeight to the window's innerHeight.
In the case when this height is a fractional value,
clientHeightrounds to the nearest integer whereasinnerHeightalways rounds down. This means when the body is set to 100% height and the browser is at a fractional height (usually due to a non-100% zoom factor), clientHeight often reports being 1 pixel taller than innerHeight.This causes the
scrollbar-gutter: stablestyle to be added, which reserves space for the non-existent scrollbar, shifting the layout.Repro:
https://stackblitz.com/edit/u47vqq?file=index.html
New Behavior
Match
innerHeight's rounding behaviour by usingbody.getBoundingClientRect().heightand manually rounding down.According to mdn,
getBoundingClientRect()is the equivalent toclientHeightexcept it returns the real fractional value: https://developer.mozilla.org/en-US/docs/Web/API/Element/clientHeightFixes #32481