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`InteractivityChecker.isFocusable` ignored the `inert` attribute, so
`FocusTrap` could pick an element inside an inert subtree as the first or
last tabbable element. Calling `focus()` on such an element is a no-op,
which left focus on the trap anchor and let Tab / Shift+Tab escape the
trapped region.
Add an `isInert` check that walks the ancestors with `closest('[inert]')`
and run it before the visibility check. The fix propagates through the
shared checker to `FocusTrap`, `ConfigurableFocusTrap`, `Dialog` and
`FocusKeyManager`.
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InteractivityChecker.isFocusableignored theinertattribute, soFocusTrapcould pick an element inside an inert subtree as the first or last tabbable element. Callingfocus()on such an element is a no-op, which left focus on the trap anchor and let Tab / Shift+Tab escape the trapped region.Add an
isInertcheck that walks the ancestors withclosest('[inert]')and run it before the visibility check. The fix propagates through the shared checker toFocusTrap,ConfigurableFocusTrap,DialogandFocusKeyManager.StackBlitz demo of the bug: https://stackblitz.com/edit/cdk-trap-focus-with-inert?file=src%2Fmain.ts