RFR: 8342401: [TESTBUG] javax/swing/JSpinner/8223788/JSpinnerButtonFocusTest.java test fails in ubuntu 22.04 on SBR Hosts [v2]

[Prasanta Sadhukhan]

> Test probably was failing due to lack of delay between UI creation and test execution..Delay is added along with rendering frame at screen centre..Also added listener closer to UI creation within EDT
> CI run for 100 iterations are ok on all platforms..

Prasanta Sadhukhan has updated the pull request incrementally with one additional commit since the last revision:

  Review comment

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Changes:
  - all: https://git.openjdk.org/jdk/pull/27815/files
  - new: https://git.openjdk.org/jdk/pull/27815/files/4482c22a..f808f507

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27815&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27815&range=00-01

  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/27815.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27815/head:pull/27815

PR: https://git.openjdk.org/jdk/pull/27815