There have been flaky runs of smoke tests on macOS that stop an instance of Code and start it again to check on previous state. In those runs, exitApplication did not shutdown the application and our attempt then to use treekill prevents data / state from getting written, so the smoke test essentially fails.

We have to understand why exitApplication sometimes hangs.

Refs:

• Flaky fail on open editor restore timeout #157576
• Smoke test failure: "verifies opened editors are restored" #152345
• Smoke tests: verifies that auto save triggers on shutdown: #155838