[jdk17u-dev] RFR: 8296083: javax/swing/JTree/6263446/bug6263446.java fails intermittently on a VM

[Victor Rudometov]

[JDK-8296083](https://bugs.openjdk.org/browse/JDK-8296083) javax/swing/JTree/6263446/bug6263446.java fails intermittently on a VM

Clean backport. 
Test update, low risk.
Test passed during manual run (run in a 50 loop).

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Commit messages:
 - Backport dd9aa7272d04b49dd5cbf3ff9f9091c7d63d68ae

Changes: https://git.openjdk.org/jdk17u-dev/pull/897/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=897&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8296083
  Stats: 25 lines in 1 file changed: 21 ins; 1 del; 3 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/897.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/897/head:pull/897

PR: https://git.openjdk.org/jdk17u-dev/pull/897