delete-session output-buffer fix (#772) #530

Job	Run time
test (ubuntu-latest, 27.2, false)	1m 52s
test (ubuntu-latest, 28.2, false)	2m 8s
test (ubuntu-latest, 29.1, false)	1m 54s
test (macos-latest, 27.2, false)	4m 29s
test (macos-latest, 28.2, false)	5m 3s
test (macos-latest, 29.1, false)	4m 25s
test (windows-latest, 27.2, false)	1m 36s
test (windows-latest, 28.2, false)	1m 37s
test (windows-latest, 29.1, false)	1m 46s
test (ubuntu-latest, snapshot, true)	1m 47s
test (macos-latest, snapshot, true)	4m 48s
test (windows-latest, snapshot, true)	31s
	31m 56s

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