RFR: 8370511: test/jdk/javax/swing/JSlider/bug4382876.java does not release previously pressed keys

[Alexander Zvegintsev]

The test does not release previously pressed keys, which may cause failures in subsequent tests.

Testing looks good on all platforms.

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Commit messages:
 - 8370511: test/jdk/javax/swing/JSlider/bug4382876.java does not release previously pressed keys

Changes: https://git.openjdk.org/jdk/pull/27959/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27959&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8370511
  Stats: 7 lines in 1 file changed: 7 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/27959.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27959/head:pull/27959

PR: https://git.openjdk.org/jdk/pull/27959