Hartmut
0e9d6ec388
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useLayoutEffect([]) fired before isInitialLoading resolved, so the scroll container had no canvas yet — scrollLeft was clipped to 0. Now the scroll-to-today fires on the first render where totalCanvasWidth becomes non-zero. The cleanup effect resets the guard on unmount so React Strict Mode's fake-unmount+remount also scrolls correctly. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>