fix(registry): fix message-scroller scrollbar strobing during autoscroll on classic scrollbar platforms (#11576) - #11580
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…oll on classic scrollbar platforms (shadcn-ui#11576)
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Summary
Closes #11576.
In
apps/v4/registry/new-york-v4/ui/message-scroller.tsx,MessageScrollerViewportapplieddata-autoscrolling:scrollbar-none.During programmatic streaming scrolls, the
data-autoscrollingattribute toggles at chunk cadence (clearing after ~180ms timeout). When network/LLM chunk intervals exceed this threshold, the attribute flips on and off repeatedly, causingscrollbar-widthto alternate betweenthinandnone. On platforms with classic scrollbars (Windows, Linux, macOS with "Show scroll bars: Always"), this causes the scrollbar to strobe visibly and reflow content on each flip.This change aligns
new-york-v4/ui/message-scroller.tsxwith thebases/radix,bases/base, andbases/ariaimplementations which usedata-autoscrolling:scrollbar-thumb-transparent data-autoscrolling:scrollbar-track-transparentinstead ofscrollbar-none.Changes
data-autoscrolling:scrollbar-nonewithdata-autoscrolling:scrollbar-thumb-transparent data-autoscrolling:scrollbar-track-transparentinapps/v4/registry/new-york-v4/ui/message-scroller.tsx.