In JDK-8169828, code text added to the editor text appears to
intermittently cause the untouched initial statement to be re-evaluated.

This issue is independent of EditorTestBase.testStatementMush()
was designed to test.

This bug therefore also marks a work-around to the re-evaluation
issue.

Possible causes:

- Timing issues in the reset of ReplToolTesting.userout
- Communication or other issues with the external editor simulation CustomEditor
- White-space issues (platform dependent?) in the snippet processing cmdEdit, SourceCodeAnalysisImpl, ...
- ...