[navigation-menu] Fix pointer-events lock when sweeping quickly across a trigger

[edwardhorsey]

Fixes #5453.

When the pointer sweeps across a trigger too quickly for its content to open, the safe-polygon pointer-events: none lock is never released. Currently all the existing release paths only run after a menu has opened so in this case the list is left frozen.

This PR calls clearSafePolygonPointerEventsMutation on the trigger's mouseleave when no item is open.

• 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@5454
  

  pnpm add https://pkg.pr.new/mui/base-ui/@base-ui/utils@5454
  

commit: 483ec3a

[code-infra-dashboard]

Bundle size

Bundle	Parsed size	Gzip size
@base-ui/react	🔺+26B(+0.01%)	🔺+6B(0.00%)

Details of bundle changes

Performance

Total duration: 1,376.22 ms +46.90 ms^(+3.5%) | Renders: 76 ⁽⁺⁰⁾ | Paint: 2,131.94 ms +32.61 ms^(+1.6%)

Test	Duration	Renders
Popover mount (300 instances)	80.48 ms 🔺+16.71 ms(+26.2%)	1 (+0)

14 tests within noise — details

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[atomiks]

Thanks for the fix!