[jdk13u-dev] Integrated: 8196100: javax/swing/text/JTextComponent/5074573/bug5074573.java fails

[Yuri Nesterenko]

I'd like to backport this fix to improve realSync behavior in some cases.

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Commit messages:
 - Backport 973255c469d794afe8ee74b24ddb5048bfcaadf7

Changes: https://git.openjdk.java.net/jdk13u-dev/pull/288/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk13u-dev&pr=288&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8196100
  Stats: 242 lines in 9 files changed: 192 ins; 20 del; 30 mod
  Patch: https://git.openjdk.java.net/jdk13u-dev/pull/288.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk13u-dev pull/288/head:pull/288

PR: https://git.openjdk.java.net/jdk13u-dev/pull/288