RFR: 8316388: Opensource five Swing component related regression tests [v3]

[Alexander Zuev]

> Cleaned up five more tests.
> 
> Continuation of https://github.com/openjdk/jdk/pull/18184
> 
> Unfortunately one of the commits rendered the whole PR invalid so i closed it and restarting it here.
> All comments from the previous review are addressed.

Alexander Zuev has updated the pull request incrementally with one additional commit since the last revision:

  Update test/jdk/javax/swing/JDesktopPane/bug4773378.java
  
  Co-authored-by: Alexey Ivanov <alexey.ivanov at oracle.com>

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/18259/files
  - new: https://git.openjdk.org/jdk/pull/18259/files/de3acd64..fa83e095

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18259&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18259&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/18259.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18259/head:pull/18259

PR: https://git.openjdk.org/jdk/pull/18259