8368328: CompactNumberFormat.clone does not produce independent instances

[rm-gh-8]

Backporting JDK-8368328: CompactNumberFormat.clone does not produce independent instances. Fixes clone method logic and adds a new test. Ran GHA Sanity Checks (passed) and new test (passed). Patch is clean.

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Progress

• JDK-8368328 needs maintainer approval
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8368328: CompactNumberFormat.clone does not produce independent instances (Bug - P4 - Requested)

Reviewing

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$ git fetch https://git.openjdk.org/jdk17u-dev.git pull/4168/head:pull/4168
$ git checkout pull/4168

Update a local copy of the PR:
$ git checkout pull/4168
$ git pull https://git.openjdk.org/jdk17u-dev.git pull/4168/head

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Checkout this PR locally:
$ git pr checkout 4168

View PR using the GUI difftool:
$ git pr show -t 4168

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Download this PR as a diff file:
https://git.openjdk.org/jdk17u-dev/pull/4168.diff

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[bridgekeeper]

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[openjdk]

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See the Progress checklist in the description for automated requirements.

[openjdk]

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

[openjdk]

⚠️ @rm-gh-8 This change is now ready for you to apply for maintainer approval. This can be done directly in each associated issue or by using the /approval command.

[mlbridge]

Webrevs

• 00: Full (a698def2)

[j3graham]

It might be worth considering a backport of JDK-8354522 (Clones of DecimalFormat cause interferences when used) together with this. The fix for CompactNumberFormat.clone relies on DecimalFormat.clone which also had issues before this other fix.

[rm-gh-8]

/approval request for backport of JDK-8368328: CompactNumberFormat.clone does not produce independent instances.

Ran the new test on linux-x64, linux-aarch64, macos-aarch64 and windows-x64:

(All Passed) - make test TEST=test/jdk/java/text/Format/CompactNumberFormat/TestClone.java

Results are attached.
linux-aarch64-specific-test.log
linux-x64-specific-test.log
macos-aarch64-specific-test.log
windows-x64-specific-test.log

[openjdk]

@rm-gh-8
8368328: The approval request has been created successfully.