[jdk21u-dev] RFR: 8318590: JButton ignores margin when painting HTML text

[Goetz Lindenmaier]

I backport this for parity with 21.0.3-oracle.

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Commit messages:
 - Backport acaf2c8dcfd5235f758af2fe3e308b72263113e4

Changes: https://git.openjdk.org/jdk21u-dev/pull/182/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=182&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8318590
  Stats: 193 lines in 4 files changed: 8 ins; 177 del; 8 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/182.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/182/head:pull/182

PR: https://git.openjdk.org/jdk21u-dev/pull/182