[react-interactions] Add onFocusWithin event to FocusWithin responder #17115
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This adds the
onFocusWithin
event callback to theFocusWithin
event responder. We already haveonBlurWithin
which is required for our rich internal focus management and accessibility component experiments and now we also needonFocusWithin
so we can properly handle cases where we need to remember the last focused node in the cases where we have to restore focus.