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Replace the global scrollbar gutter with JS compensation - #43283
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Pages with classic scrollbars reserve a permanent blank gutter even when they do not scroll. Removing that gutter alone makes the page shift when a dialog opens. Measure root and full-width fixed-element expansion when locking scroll. Restore the original inline styles after the last owner closes. Share this lock between Dialog and Drawer, including native close and disposal paths.
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The new Dialog and Drawer scroll lock increases three JavaScript bundles beyond their size limits. Raise only those limits to the next quarter-kilobyte boundary using the existing budget update script.
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scrollbar-gutter: stable#42546. Dialog and Drawer now measure layout changes and apply temporary offsets while page scrolling is locked.Fixes #42546