[jdk17u-dev] RFR: 5074006: Swing JOptionPane shows </html> tag as a string after newline

[Goetz Lindenmaier]

I backport this for parity with 17.0.16-oracle.

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Commit messages:
 - Backport 91072ee3934616ab2edc4850a59c0a25fd0de3b4

Changes: https://git.openjdk.org/jdk17u-dev/pull/3318/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3318&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-5074006
  Stats: 158 lines in 2 files changed: 118 ins; 26 del; 14 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3318.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3318/head:pull/3318

PR: https://git.openjdk.org/jdk17u-dev/pull/3318