RFR: 8361192: Test java/awt/Mixing/AWT_Mixing/JSplitPaneOverlapping.java fails on all platforms [v2]

[Khalid Boulanouare]

> Changes heavyweight color to white, for the test to pass.

Khalid Boulanouare has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains three commits:

 - Merge branch 'pr/25971' into jdk-8361192
 - Removes test from Problem List
 - Sets heavyweight background and foreground colors different than the back frame color

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Changes: https://git.openjdk.org/jdk/pull/26167/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26167&range=01
  Stats: 4 lines in 2 files changed: 2 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/26167.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26167/head:pull/26167

PR: https://git.openjdk.org/jdk/pull/26167