[jdk11u-dev] RFR: 8269951: [macos] Focus not painted in JButton when setBorderPainted(false) is invoked

[Martin Doerr]

Backport of JDK-8269951. Applies cleanly except Copyright year update.

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Commit messages:
 - Backport 481c1f0549e361e8e83fcf0530acc4ebdb60104b

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/344/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=344&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8269951
  Stats: 121 lines in 2 files changed: 120 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/344.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/344/head:pull/344

PR: https://git.openjdk.java.net/jdk11u-dev/pull/344