[jdk17u-dev] RFR: 8292948: JEditorPane ignores font-size styles in external linked css-file

[Martin Doerr]

Clean backport of [JDK-8292948](https://bugs.openjdk.org/browse/JDK-8292948). The included test fails without the fix and passes with it.

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Commit messages:
 - Backport 1caba0f13c42121c9e1c6648715ec7c31349b537

Changes: https://git.openjdk.org/jdk17u-dev/pull/2545/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2545&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8292948
  Stats: 217 lines in 4 files changed: 211 ins; 4 del; 2 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2545.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2545/head:pull/2545

PR: https://git.openjdk.org/jdk17u-dev/pull/2545