As discussed in https://bugs.openjdk.java.net/browse/JDK-8285094 it seems that 
the test
java/awt/Frame/GetGraphicsStressTest/GetGraphicsStressTest.java destabilises 
the Xserver.
This causes java/awt/Frame/InvisibleOwner/InvisibleOwner.java to fail and even 
before that
other tests which do  pass are not visibly behaving as expected.

I didn't find any Xserver logs of "bad stuff" happening so it just seems like 
the Xserver was
having trouble keeping up and JDK was behaving correctly as it could despite 
the Xserver sending
lots of requests to repaint.

Just the "sleep" at the end of GetGraphicsStressTest.java seems to be enough 
but I'd already
reworked InvisibleOwner.java and I'd like to think it is a bit better than 
before.

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Commit messages:
 - 8285094
 - 8285094

Changes: https://git.openjdk.java.net/jdk/pull/8312/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8312&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8285094
  Stats: 138 lines in 2 files changed: 74 ins; 9 del; 55 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8312.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8312/head:pull/8312

PR: https://git.openjdk.java.net/jdk/pull/8312

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