[popover2] various fixes and improvements #4512
Merged
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Fixes #4502, fixes #4503, fixes #4511
Checklist
Changes proposed in this pull request:
rootBoundary
propMenuItem
dismissalportalClassName
correctly to the Portal container, not its child Overlay (fixes Popover2: portalClassname is not actually applied to portal #4511)Screenshot
showing fix #4503 first, then #4502: