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The sticky header/footer wrapper width was narrowed by a separately JS-measured scrollbar size, while the column widths shared via colgroup were computed against the browser's own `scrollbar-gutter: stable` reservation used by the body div. These two numbers aren't guaranteed to agree, and when the probe overstates the real reservation the fixed-layout table overflows its `overflow: hidden` wrapper, clipping the rightmost column -- typically the totals row once a chart is resized enough to need a vertical scrollbar. Header and footer now reserve space via the same `scrollbar-gutter` property the body already uses, so all three always agree. Fixes #21063