RFR: JDK-8315889: Open source several Swing HTMLDocument related tests

[Tejesh R]

On Tue, 12 Sep 2023 17:05:47 GMT, Harshitha Onkar <honkar at openjdk.org> wrote:

> Following tests are being open sourced as part of this PR.
> 
> javax/swing/text/html/HTMLDocument/4251593/bug4251593.java
> javax/swing/text/html/HTMLDocument/4687405/bug4687405.java
> javax/swing/text/html/HTMLDocument/4226914/bug4226914.java
> javax/swing/text/html/HTMLEditorKit/4213373/bug4213373.java

Marked as reviewed by tr (Committer).

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PR Review: https://git.openjdk.org/jdk/pull/15687#pullrequestreview-1625846117