8068310: [TEST_BUG] Test javax/swing/JColorChooser/Test4234761.java fails with GTKL&F

[rm-gh-8]

Backporting JDK-8068310: [TEST_BUG] Test javax/swing/JColorChooser/Test4234761.java fails with GTKL&F.

This PR fixes a bug where Test4234761.java throws a ClassCastException (JPanel cannot be cast to JTabbedPane
) when run under the GTK Look and Feel. The GTK L&F uses a different internal component structure for JColorChooser and it doesn't use a JTabbedPane for the color panel tabs, so the test's assumption of casting a child component to JTabbedPane fails. The fix skips the test entirely under GTK L&F using jtreg.SkippedException, since the test's tab-switching logic is structurally incompatible with GTK's implementation.

For parity with Oracle JDK.

Ran related tests on linux-x64, linux-aarch64, macos-aarch64 and windows-x64:

make test TEST=test/jdk/javax/swing/JColorChooser/Test4234761.java

Results attached:

windows-x64-specific-test.log
macos-aarch64-specific-test.log
linux-x64-specific-test.log
linux-aarch64-specific-test.log

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8068310 needs maintainer approval

Issue

• JDK-8068310: [TEST_BUG] Test javax/swing/JColorChooser/Test4234761.java fails with GTKL&F (Bug - P4 - Requested)

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https://git.openjdk.org/jdk25u-dev/pull/370.diff

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[openjdk]

This backport pull request has now been updated with issue from the original commit.

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• 00: Full (66b4b938)

[rm-gh-8]

/approval request for backport of JDK-8068310: [TEST_BUG] Test javax/swing/JColorChooser/Test4234761.java fails with GTKL&F.

This is a test fix.

For parity with Oracle JDK.

[openjdk]

@rm-gh-8
8068310: The approval request has been created successfully.