<Swing Dev> RFR: 8261689: javax/swing/JComponent/7154030/bug7154030.java still fails with "Exception: Failed to hide opaque button"

[Alexander Zuev]

8261689: javax/swing/JComponent/7154030/bug7154030.java still fails with "Exception: Failed to hide opaque button"

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Commit messages:
 - 8261689: javax/swing/JComponent/7154030/bug7154030.java still fails with "Exception: Failed to hide opaque button"

Changes: https://git.openjdk.java.net/jdk/pull/2790/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2790&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8261689
  Stats: 21 lines in 1 file changed: 19 ins; 1 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2790.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2790/head:pull/2790

PR: https://git.openjdk.java.net/jdk/pull/2790