RFR: 8316056: Open source several Swing JTree tests [v2]

[Damon Nguyen]

> These are the tests being converted:
> 
> javax/swing/JTree/4210432/bug4210432.java
> javax/swing/JTree/4213868/bug4213868.java
> javax/swing/JTree/4224491/bug4224491.java
> javax/swing/JTree/4237370/bug4237370.java
> javax/swing/JTree/4662505/bug4662505.java

Damon Nguyen has updated the pull request incrementally with one additional commit since the last revision:

  Review comments changes

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Changes:
  - all: https://git.openjdk.org/jdk/pull/15756/files
  - new: https://git.openjdk.org/jdk/pull/15756/files/a9bd7dcc..8e881ae7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15756&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15756&range=00-01

  Stats: 20 lines in 4 files changed: 2 ins; 9 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/15756.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15756/head:pull/15756

PR: https://git.openjdk.org/jdk/pull/15756