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fix(ui): remove blink and shift in desktop sidebar sticky headers

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- Drive the sticky-fade identity overlay's visibility synchronously from the scroller's top-scroll attribute (CSS :has), and seed its leading project synchronously, so it appears in the same frame the mask hides the real header instead of a React commit later (removes the one-frame blink)

- Match the overlay's vertical box to the real header rows (py-1 instead of a centered h-7) so the identity does not shift a few pixels on the sticky handoff
This commit is contained in:
Bohdan Triapitsyn
2026-07-30 18:46:53 +03:00
parent 8130381f6c
commit 5328245b63
2 changed files with 34 additions and 13 deletions
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packages/ui/src/index.css
+15
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@@ -348,6 +348,21 @@ div[data-chat-input-footer="true"] {
);
}
/* Sticky-fade overlay (desktop sidebar): the crisp duplicate identity stays
mounted and its visibility is driven synchronously by the scroller's own
top-scroll data attribute — the same signal that engages the mask — so the
overlay appears in the exact frame the mask hides the real header (no blink).
ScrollShadow sets data-top-scroll when nothing is below the viewport and
data-top-bottom-scroll when content is both above and below. */
.oc-sticky-fade-overlay {
opacity: 0;
}
.oc-sticky-fade-root:has(.oc-sidebar-scroller[data-top-scroll="true"]) .oc-sticky-fade-overlay,
.oc-sticky-fade-root:has(.oc-sidebar-scroller[data-top-bottom-scroll="true"]) .oc-sticky-fade-overlay {
opacity: 1;
}
[data-scroll-shadow="true"][data-orientation="vertical"][data-bottom-scroll="true"] {
mask-image: linear-gradient(
to bottom,