Support selecting multiple fragments #1646

Job	Run time
rubocop	12s
tests (ubuntu-latest, 2.7)	23s
tests (ubuntu-latest, 3.0)	21s
tests (ubuntu-latest, 3.1)	15s
tests (ubuntu-latest, 3.2)	11s
tests (ubuntu-latest, head)	7s
tests (ubuntu-latest, truffleruby-22.2)	34s
tests (ubuntu-latest, truffleruby-22.3)	36s
tests (ubuntu-latest, truffleruby-head)	25s
tests (macos-latest, 2.7)	53s
tests (macos-latest, 3.0)	20s
tests (macos-latest, 3.1)	17s
tests (macos-latest, 3.2)	23s
tests (macos-latest, head)	14s
tests (macos-latest, truffleruby-22.2)	1m 30s
tests (macos-latest, truffleruby-22.3)	1m 26s
tests (macos-latest, truffleruby-head)	36s
	8m 43s

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