<Swing Dev> RFR: 8268284: javax/swing/JComponent/7154030/bug7154030.java fails with "Exception: Failed to hide opaque button"

[Alexander Zuev]

Reducing the height of the analyzed area to get rid of the rounded edges
at the botom of the frame. Apparently shadow outside of it being
rendered by Mac OS X Big Sur inconsistently which gives random test
failures on M1 macs with Big Sur.

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Commit messages:
 - 8268284: javax/swing/JComponent/7154030/bug7154030.java fails with "Exception: Failed to hide opaque button"

Changes: https://git.openjdk.java.net/jdk/pull/4792/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4792&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8268284
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4792.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4792/head:pull/4792

PR: https://git.openjdk.java.net/jdk/pull/4792