[combobox][autocomplete] Remove unsupported data-instant documentation

[lyzno1]

Summary

• remove the unsupported data-instant entry from the Combobox popup data attribute metadata
• regenerate the Combobox and Autocomplete API references
• update the generated component API index

Both Combobox.Popup and Autocomplete.Popup share ComboboxPopup. Its runtime state and state attribute mapping do not implement an instant animation reason, so the documented attribute was never generated on the DOM.

This documentation-only correction does not change runtime behavior.

Fixes #5350

• I have followed (at least) the PR section of the contributing guide.

[pkg-pr-new]

• base-ui-tanstack-start

• vite-css-base-ui-example

  pnpm add https://pkg.pr.new/mui/base-ui/@base-ui/react@5351
  

  pnpm add https://pkg.pr.new/mui/base-ui/@base-ui/utils@5351
  

commit: fd829f6

[code-infra-dashboard]

Bundle size

Bundle	Parsed size	Gzip size
@base-ui/react	0B(0.00%)	0B(0.00%)

Details of bundle changes

Performance

Total duration: 1,224.51 ms +57.46 ms^(+4.9%) | Renders: 78 ⁽⁺⁰⁾ | Paint: 1,919.55 ms +95.39 ms^(+5.2%)

Test	Duration	Renders
Tooltip mount (300 contained roots)	65.61 ms 🔺+16.17 ms(+32.7%)	1 (+0)

14 tests within noise — details

Metric alarms

Test	Metric	Change
Tooltip mount (300 contained roots)	bench:paint	🔺 +23.38 ms

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[aarongarciah]

@atomiks is the #⁠2 docs discovery in the PR review below a real gap? Is it intentional?

Regarding #⁠1, you can address it in this same PR @lyzno1.

PR review

Docs-only change, and the premise checks out: ComboboxPopup state has no instant/instantType and its mapping is popupStateMapping + transitionStatusMapping only, so data-instant was never emitted on Combobox.Popup or Autocomplete.Popup. Removal is correct, nothing merge-blocking.

Docs (2)

1. ℹ️ Combobox.Popup emits data-anchor-hidden but the enum still doesn't document it

Location: packages/react/src/combobox/popup/ComboboxPopupDataAttributes.ts:29

  align = CommonPopupDataAttributes.align,
  // no `anchorHidden` entry
  empty = 'data-empty',

Inverse of the gap this PR fixes, in the same file. ComboboxPopup puts anchorHidden: positioning.anchorHidden in state ([ComboboxPopup.tsx:78](packages/react/src/combobox/popup/ComboboxPopup.tsx:78)) and spreads popupStateMapping, which maps anchorHidden → data-anchor-hidden. So the popup renders an attribute the reference table omits (ComboboxPositioner documents it, Combobox.Popup does not). Pre-existing, out of the stated scope.

Failure scenario: Someone styling Combobox.Popup[data-anchor-hidden] finds no mention of it in the Popup data-attributes table and assumes only the positioner carries it.

Fix: Optional follow-up — add anchorHidden = CommonPopupDataAttributes.anchorHidden to the enum and regenerate, or confirm the omission is intentional (Menu/Popover popups don't carry anchorHidden in state at all, so combobox is the odd one out).

2. ℹ️ Doc removal hides a real behavior gap vs Menu/Popover

Location: packages/react/src/combobox/popup/ComboboxPopupDataAttributes.ts:30

Menu/Popover/Tooltip track instantType and skip exit animations on click/dismiss; combobox has no such state anywhere in packages/react/src/combobox/. Documenting reality is the right call for this PR, but the underlying parity gap (selecting a combobox item always plays the exit animation, unlike a menu item) stays unaddressed.

Failure scenario: A user migrating menu styles to combobox has no data-instant hook to suppress the close transition on item click.

Fix: No change here; worth a separate issue if instant parity is wanted.

Verdict

Approve - correct, narrowly scoped docs fix verified against the runtime state mapping, with only optional follow-up notes.

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🤖 Review generated with Claude Code

[lyzno1]

@aarongarciah Done — addressed #1 by documenting data-anchor-hidden for both Combobox.Popup and Autocomplete.Popup.

[atomiks]

@aarongarciah Since combobox is keyboard-interactive even for pointer users I think leaving it off makes sense, since iirc its purpose was to make keyboard interaction instant, with no animations (especially for Tooltip).

We can leave it off until someone files an issue about it.

[lyzno1]

@atomiks Can this PR be merged before the 1.7.0 release?