[jdk11u-dev] RFR: 8239334: Tab Size does not work correctly in JTextArea with setLineWrap on

[Martin Doerr]

Clean backport of JDK-8239334.

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Commit messages:
 - Backport 3c72042627a02c2ad12a909fc76a082d902bc35d

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/520/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=520&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8239334
  Stats: 9 lines in 2 files changed: 1 ins; 0 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/520.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/520/head:pull/520

PR: https://git.openjdk.java.net/jdk11u-dev/pull/520