[jdk11u-dev] RFR: 8297449: Update JInternalFrame Metal Border code

[Andrew Lu]

I backport this for parity with 11.0.24-oracle.

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Commit messages:
 - Backport 09629570f5d064dc2a5cd670de8d648156ac3991

Changes: https://git.openjdk.org/jdk11u-dev/pull/2667/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2667&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8297449
  Stats: 54 lines in 1 file changed: 17 ins; 21 del; 16 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2667.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2667/head:pull/2667

PR: https://git.openjdk.org/jdk11u-dev/pull/2667