add a first and last item tracker to `SelectedItems`, remove Shift+Ctrl #843

Job	Run time
build-client / build-client	10m 52s
setup-selenium / setup_chromedriver	3s
Test (3.8, 0)	12m 33s
Test (3.8, 1)	12m 32s
Test (3.8, 2)	12m 31s
	48m 31s

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