[jdk17] RFR: JDK-8269150 Unicode \u005C not treated as an escaping backslash [v4]

[Joe Darcy]

On Tue, 20 Jul 2021 12:20:09 GMT, Jim Laskey <jlaskey at openjdk.org> wrote:

>> Jim Laskey has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains four additional commits since the last revision:
>> 
>>  - Merge branch 'master' into 8269150
>>  - Updated the test to include all combinations
>>  - Merge branch 'master' into 8269150
>>  - Correct unicode escape handling in UnicodeReader, added test
>
> The fix has been revised to use the jdk15 (and before) logic. The JLS will be updated to clarify the fuzziness in this area.

@JimLaskey , please describe in text what the intended semantics are now for the escape processing. Thanks.

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PR: https://git.openjdk.java.net/jdk17/pull/126