[jdk8u-dev] RFR: 8315731: Open source several Swing Text related tests

[Sergey Bylokhov]

Hi all,

This pull request contains a backport of commit [0dc17ca0](https://github.com/openjdk/jdk11u-dev/commit/0dc17ca068b837606252e1db614fd005a2f2b942) from the [openjdk/jdk11u-dev](https://git.openjdk.org/jdk11u-dev) repository.

The commit being backported was authored by Jonathan Dowland on 5 Feb 2024 and was reviewed by Sergey Bylokhov.

Thanks!

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Commit messages:
 - 8315731: Open source several Swing Text related tests

Changes: https://git.openjdk.org/jdk8u-dev/pull/516/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=516&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315731
  Stats: 469 lines in 5 files changed: 469 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/516.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/516/head:pull/516

PR: https://git.openjdk.org/jdk8u-dev/pull/516