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Move spinner `_defaultSlowWarning` message to a new line (#30071)

* write newline before adding slow restart message to spinner
* update existing test
C
Christopher Fujino committed
ec93c87c8902c63e5b0e71ff761f201d19dc4327
Parent: b70d260
Committed by GitHub <noreply@github.com> on 3/28/2019, 5:08:44 PM