[jdk11u-dev] RFR: 8297449: Update JInternalFrame Metal Border code [v2]

[Andrew Lu]

> I backport this for parity with 11.0.24-oracle.

Andrew Lu has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  Backport 09629570f5d064dc2a5cd670de8d648156ac3991

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Changes:
  - all: https://git.openjdk.org/jdk11u-dev/pull/2667/files
  - new: https://git.openjdk.org/jdk11u-dev/pull/2667/files/3758d89e..4ef423f2

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2667&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2667&range=00-01

  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 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