RFR: 8316274: javax/swing/ButtonGroup/TestButtonGroupFocusTraversal.java fails in Ubuntu 23.10 with Motif LAF [v2]

[Alexander Zvegintsev]

> The test began to fail in Ubuntu 23.10. While investigating, I found and filed two new issues:
> 
> * https://bugs.openjdk.org/browse/JDK-8370624 JToggleButton does not display caption if setAction is called
>  e.g. setAction vs addActionListener 
> <img width="287" height="86" alt="image" src="https://github.com/user-attachments/assets/28d24449-e5aa-41fb-a5f1-470ab11d6899" /> vs <img width="287" height="86" alt="image" src="https://github.com/user-attachments/assets/04cdd4ed-6ea4-403c-86c3-f60971d16007" />
> * https://bugs.openjdk.org/browse/JDK-8370627 motif look and feel focus traversal order may vary depending on the system version
> 
> 
> This test fix changes `setAction` to  `addActionListener` and it is to avoid problemlisting the test on Linux.
> 
> Testing looks good.

Alexander Zvegintsev has updated the pull request incrementally with two additional commits since the last revision:

 - title
 - review comments

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/27979/files
  - new: https://git.openjdk.org/jdk/pull/27979/files/9d3495c7..a4680193

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27979&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27979&range=00-01

  Stats: 26 lines in 1 file changed: 0 ins; 21 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/27979.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27979/head:pull/27979

PR: https://git.openjdk.org/jdk/pull/27979