RFR: 8295006: Colored text is not shown on disabled checkbox and radio button with GTK LAF for bug4314194. [v3]

[Abhishek Kumar]

> Existing test `open/test/jdk/javax/swing/JRadioButton/4314194/bug4314194.java` was not showing colored text for disabled checkbox and radiobutton in GTK LAF.
> 
> The fix is to get the disabled state color for checkbox and radiobutton from UIManager if it exists. 
> 
> Test case `open/test/jdk/javax/swing/JRadioButton/4314194/bug4314194.java` has been checked in CI pipeline. Link is attached in JBS.

Abhishek Kumar has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains five commits:

 - Merge
 - Merge
 - ProblemList.txt file merge resolved
 - 8295006 entry removed from problem lists
 - Fix for disabled checkbox and radiobutton colored text

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Changes: https://git.openjdk.org/jdk/pull/10755/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10755&range=02
  Stats: 13 lines in 2 files changed: 12 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/10755.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10755/head:pull/10755

PR: https://git.openjdk.org/jdk/pull/10755