RFR: JDK-8315951: Open source several Swing HTMLEditorKit related tests [v3]

[Harshitha Onkar]

> Following tests are open sourced as part of this PR.
> 
> 1. java/awt/event/PaintEvent/RepaintTest/RepaintTest.java
> 2. javax/swing/text/html/HTMLEditorKit/4214848/bug4214848.java
> 3. javax/swing/text/html/HTMLEditorKit/4230197/bug4230197.java
> 4. javax/swing/text/html/HTMLEditorKit/4238223/bug4238223.java

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

  review change

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/15751/files
  - new: https://git.openjdk.org/jdk/pull/15751/files/10df4fcb..b7b10e02

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15751&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15751&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/15751.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15751/head:pull/15751

PR: https://git.openjdk.org/jdk/pull/15751