Fix selection of parentholder for button dropdown (#30835) #6539

Job	Run time
gh-travis	0s
phan / Run phan	3m 25s
pre-commit / pre-commit	3m 57s
windows-ci / win-test (windows-latest, 7.4)	5m 15s
phpstan / php-stan (8.2)	1m 7s
	13m 44s

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