RFR: 8172065: javax/swing/JTree/4908142/bug4908142.java The selected index should be "aad" [v2]

[Prasanta Sadhukhan]

> Test is failing in macosx-12 in aarch64 system. Added stability fixes of delay after frame is visible, making frame to center of screen to make the test stable in macos12-aarch64 system too.
> Modified test passes in all CI platforms including osx-aarch64 system in osx11 and osx12.

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

  Add waitForIdle

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/6661/files
  - new: https://git.openjdk.java.net/jdk/pull/6661/files/4f267d7f..6d561fa0

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=6661&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=6661&range=00-01

  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6661.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6661/head:pull/6661

PR: https://git.openjdk.java.net/jdk/pull/6661