RFR: JDK-8215218: Test ToolTabSnippetTest.testCleaningCompletionTODO failed on Windows

[Jan Lahoda]

Hi,

After JLine 3.9.0 upgrade (JDK-8214491), the 
ToolTabSnippetTest.testCleaningCompletionTODO test failed on Windows (I 
ran the tests several times before pushing the change, but sadly did not 
see this one, so it may be random).

 From the log, it is not quite clear what is the problem. The exception is:
java.lang.InterruptedException
  at java.base/java.lang.Object.wait(Native Method)
  at java.base/java.lang.Thread.join(Thread.java:1302)
  at UITesting.doRunTest(UITesting.java:116)
  at 
ToolTabSnippetTest.testCleaningCompletionTODO(ToolTabSnippetTest.java:212)

The UITesting.doRunTest is there trying to do Thread.join. It is not 
quite clear if the problem is just he InterruptedException from the 
join, or is there was already a different failure before, hidden by this 
one.

So, I'd like to propose that the InterruptedException is handled by the 
test (as we do on other places), and that should either solve the 
problem, or we will hopefully start to see the real underlying problem.

Proposed webrev:
http://cr.openjdk.java.net/~jlahoda/8215218/webrev.00/
JBS: https://bugs.openjdk.java.net/browse/JDK-8215218

(Running tests with the patch as well, in case it would reveal something.)

Thanks,
     Jan