backstage/.changeset/fix-tabs-active-indicator-disappearing.md at e907ba6fe112b38c3c721e8dd533191e79b6d28b

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Johan Persson c6fc76f532 fix(ui): prevent hidden Tabs tree from stomping active indicator opacity

React Aria's `CollectionBuilder` renders `TabList`'s children into both a
hidden collection-building tree and the real DOM. The hidden instance of
`TabsIndicators` sits outside the `TabListStateContext` provider, so its
`state` is `null` — causing its `updateCSSVariables` effect to hit the
`else` branch and write `--active-tab-opacity: 0` to the `tabsRef` DOM
element that the real instance also writes to. Under the right render
ordering, this hidden write lands after the real instance's `opacity: 1`
and makes the active indicator disappear on uncontrolled Tabs.

Guard `updateCSSVariables` with an early return when `state == null` so
the hidden instance never writes to the shared DOM element.

Signed-off-by: Johan Persson <johanopersson@gmail.com>

2026-04-17 14:18:22 +02:00

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@backstage/ui

@backstage/ui
patch

Fixed an issue where the active tab indicator would disappear shortly after page load for uncontrolled Tabs.

Affected components: Tabs

172 B Raw Blame History

172 B

Raw Blame History