align multiview `HistoryPanel` details header based on content #971

Job	Run time
build-client / build-client	11m 47s
setup-selenium / setup_chromedriver	3s
Test (3.8, 0)	4m 12s
Test (3.8, 1)	5m 9s
Test (3.8, 2)	4m 12s
	25m 23s

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