RFR: 8307325: Verify the focus owner when non focused windows requesting focus [v2]

[Ravi Gupta]

> Write a test Check, when the top level Window is not the focused Window requesting for focus and becoming the Focus Owner for any Component in that Window checking the following
> 
> 1.The Component is the Focus Owner and the Window becomes the focused Window If the platform supports cross requesting focus
> across Windows.
> 2.The request is remembered and  be granted when the Window is later focused If the platform does not support requesting focus
> across Windows.
> 
> Testing:
> Tested using Mach5(20 times per platform) in macos,linux and windows and got all pass.

Ravi Gupta has updated the pull request incrementally with one additional commit since the last revision:

  8307325: Review comments fixed

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/13790/files
  - new: https://git.openjdk.org/jdk/pull/13790/files/57887a48..d09ead4e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13790&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13790&range=00-01

  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/13790.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13790/head:pull/13790

PR: https://git.openjdk.org/jdk/pull/13790