[popover2] fix(Popover2): close properly when target focus lost #5080
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The assumption that "a click handler somewhere else will close the popover if necessary" does not appear to be valid. If the user clicks on a non-focusable element. There are no other events that cause the popover to close other than mouseleave, but the mouse is not over the target when focus is lost.
Fixes #4503.
Fixes #0000
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