RFR: 8315669: Open source several Swing PopupMenu related tests [v3]

[Tejesh R]

> Open source these Swing PopupMenu related tests:
> 
> javax/swing/JPopupMenu/4236750/bug4236750.java
> javax/swing/JPopupMenu/4321273/bug4321273.java
> javax/swing/JPopupMenu/4711693/bug4711693.java
> javax/swing/JPopupMenu/4962731/bug4962731.java
> javax/swing/JPopupMenu/4966109/bug4966109.java
> javax/swing/JPopupMenu/5091257/bug5091257.java

Tejesh R has updated the pull request incrementally with one additional commit since the last revision:

  Review fix

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/15704/files
  - new: https://git.openjdk.org/jdk/pull/15704/files/42af3a0b..be68474d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15704&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15704&range=01-02

  Stats: 6 lines in 2 files changed: 1 ins; 3 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/15704.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15704/head:pull/15704

PR: https://git.openjdk.org/jdk/pull/15704