RFR: 8360498: [TEST_BUG] Some Mixing test continue to fail [v4]

[Khalid Boulanouare]

> This PR will consolidate fixes of the following bugs:
> 
> https://bugs.openjdk.org/browse/JDK-8361188
> https://bugs.openjdk.org/browse/JDK-8361189
> https://bugs.openjdk.org/browse/JDK-8361190
> https://bugs.openjdk.org/browse/JDK-8361191
> https://bugs.openjdk.org/browse/JDK-8361192
> https://bugs.openjdk.org/browse/JDK-8361193
> https://bugs.openjdk.org/browse/JDK-8361195
> 
> This PR depends on https://github.com/openjdk/jdk/pull/25971

Khalid Boulanouare has updated the pull request incrementally with six additional commits since the last revision:

 - Adds more debugging for picked color
 - Removes test from Problem List
 - Fixes color comparison on for MacOS X
 - Problem unlist test
 - Updates copyright years
 - Sets heavyweight background and foreground colors different than the back frame color

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/26625/files
  - new: https://git.openjdk.org/jdk/pull/26625/files/b54f41ed..e840a719

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26625&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26625&range=02-03

  Stats: 30 lines in 3 files changed: 22 ins; 2 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/26625.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26625/head:pull/26625

PR: https://git.openjdk.org/jdk/pull/26625