RFR: 8357996: Use "stdin.encoding" for reading System.in with InputStreamReader/Scanner [tools] [v3]

[Volkan Yazici]

On Fri, 6 Jun 2025 07:08:28 GMT, Volkan Yazici <vyazici at openjdk.org> wrote:

>> Passes the `Charset` read from the `stdin.encoding` system property while creating `InputStreamReader` or `Scanner` instances for `System.in`.
>> 
>> `stdin.encoding` is a recently added property for Java 25 in [JDK-8350703](https://bugs.openjdk.org/browse/JDK-8350703). Employing it throughout the entire code base is addressed by the parent ticket [JDK-8356893](https://bugs.openjdk.org/browse/JDK-8356893). JDK-8357996 this PR is addressing is a sub-task of JDK-8356893 and is concerned with only areas related to tools.
>
> Volkan Yazici has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains seven commits:
> 
>  - Merge remote-tracking branch 'upstream/master' into stdinEnc-build
>  - Provide fallback for `stdin.encoding` in `ExternalEditor`
>  - Discard changes unrelated with build and tools
>  - Revert superfluous changes
>    
>    Remove assertion in `DOMImplementationRegistry`
>  - Revert changes to 3rd parties in `com/sun/org/apache`
>  - Revert `PandocFilter` changes
>    
>    `PandocFilter` et al. gets called using the boot JDK,
>    which doesn't have `stdin.encoding` yet.
>  - Use `stdin.encoding` in `InputStreamReader` and `Scanner` instantiations
>    
>    Improve `CharsetTest`

@naotoj, thanks so much for taking time to review the changes. Your recent remarks explain why the current set of changes are superfluous – closing the PR.

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PR Comment: https://git.openjdk.org/jdk/pull/25541#issuecomment-2969245930