RFR: JDK-8315824: Open source several Swing Text/HTML related tests [v3]

[Harshitha Onkar]

> This PR open sources few Swing Text/HTML related tests.

Harshitha Onkar has updated the pull request incrementally with one additional commit since the last revision:

  test update

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/15675/files
  - new: https://git.openjdk.org/jdk/pull/15675/files/711e464b..efd72128

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15675&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15675&range=01-02

  Stats: 72 lines in 3 files changed: 18 ins; 23 del; 31 mod
  Patch: https://git.openjdk.org/jdk/pull/15675.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15675/head:pull/15675

PR: https://git.openjdk.org/jdk/pull/15675