[jdk17u-dev] RFR: 8328953: JEditorPane.read throws ChangedCharSetException

[Martin Doerr]

Backport of [JDK-8328953](https://bugs.openjdk.org/browse/JDK-8328953). Clean except Copyright year change.

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Commit messages:
 - Backport dc831aa750351c2b38cf5fee42d93ff62a230a28

Changes: https://git.openjdk.org/jdk17u-dev/pull/2528/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2528&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328953
  Stats: 118 lines in 2 files changed: 92 ins; 16 del; 10 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2528.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2528/head:pull/2528

PR: https://git.openjdk.org/jdk17u-dev/pull/2528