[jdk11u-dev] RFR: 8328953: JEditorPane.read throws ChangedCharSetException

[Martin Doerr]

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

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Commit messages:
 - Backport 245514da51ef77757f530317e079a3f58370a0be

Changes: https://git.openjdk.org/jdk11u-dev/pull/2780/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2780&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/jdk11u-dev/pull/2780.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2780/head:pull/2780

PR: https://git.openjdk.org/jdk11u-dev/pull/2780