show history text on flex panel hide/unhide button #1210

Job	Run time
build-client / build-client	10m 4s
setup-selenium / setup_chromedriver	3s
Test (3.8, 0)	38m 10s
Test (3.8, 1)	48m 19s
Test (3.8, 2)	44m 53s
	2h 21m 29s

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