[jdk11u-dev] RFR: 8263970: Manual test javax/swing/JTextField/JapaneseReadingAttributes/JapaneseReadingAttributes.java failed

[Goetz Lindenmaier]

I backport this for parity with 11.0.20-oracle.

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Commit messages:
 - Backport 75b039a43c5beddee21648499df534bdcf7e2fa1

Changes: https://git.openjdk.org/jdk11u-dev/pull/1988/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1988&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8263970
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1988.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/1988/head:pull/1988

PR: https://git.openjdk.org/jdk11u-dev/pull/1988