[jdk11u-dev] RFR: 8139173: [macosx] JInternalFrame shadow is not properly drawn

[Ichiroh Takiguchi]

Backport JDK-8139173

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Commit messages:
 - Backport f7814c120bf84d7e9b459f81a6ce19b44fa122ec

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/1101/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=1101&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8139173
  Stats: 147 lines in 2 files changed: 143 ins; 2 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/1101.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/1101/head:pull/1101

PR: https://git.openjdk.java.net/jdk11u-dev/pull/1101