The fix to https://bugs.openjdk.org/browse/JDK-8306927 switched the default collation for Swedish to the modern one. In order to provide a means for users who need the old collation, this PR intends to make `Collator` recognize the `co` Unicode locale extension so that multiple implementations for a locale can be provided. I would also like reviews for the corresponding CSR.
------------- Commit messages: - Test refinement - Clean-up - javadoc - 8307547: Support for multiple collation tables Changes: https://git.openjdk.org/jdk/pull/13917/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13917&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8307547 Stats: 71 lines in 4 files changed: 57 ins; 4 del; 10 mod Patch: https://git.openjdk.org/jdk/pull/13917.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/13917/head:pull/13917 PR: https://git.openjdk.org/jdk/pull/13917
