delete-session output-buffer fix #529

Job	Run time
test (ubuntu-latest, 27.2, false)	1m 46s
test (ubuntu-latest, 28.2, false)	2m 2s
test (ubuntu-latest, 29.1, false)	1m 50s
test (macos-latest, 27.2, false)	4m 53s
test (macos-latest, 28.2, false)	4m 48s
test (macos-latest, 29.1, false)	5m 20s
test (windows-latest, 27.2, false)	1m 27s
test (windows-latest, 28.2, false)	1m 39s
test (windows-latest, 29.1, false)	1m 26s
test (ubuntu-latest, snapshot, true)	1m 47s
test (macos-latest, snapshot, true)	4m 6s
test (windows-latest, snapshot, true)	48s
	31m 52s

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