[tooltip] Prevent stuck-open tooltip when child becomes disabled#48606
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This surfaced as a flaky
test_browser_legacyfailure of<Tooltip /> > focus > closes when the focused child becomes disabled.When a focused Tooltip child becomes
disabled, the close is scheduled through the React #9142 native-blur workaround. The layout shift from disabling the anchor (and repositioning the interactive popper) can make the browser dispatch a straymouseoveron the popper, which cancelled the pending close (leaveTimer.clear()inhandleMouseOver) and re-opened the tooltip — leaving it stuck open.handleMouseOvernow ignores events while the anchor is disabled, so a disabled anchor can't (re)open its tooltip. Adds a deterministic regression test that dispatches the straymouseoverwithin aleaveDelaywindow.