RFR: 8295729: Add jcheck whitespace checking for properties files [v3]

[Alexey Ivanov]

On Mon, 24 Oct 2022 19:21:07 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> Properties files is essentially source code. It should have the same whitespace checks as all other source code, so we don't get spurious trailing whitespace changes.
>> 
>> With the new Skara jcheck, it is possible to increase the coverage of the whitespace checks (in the old mercurial version, this was more or less impossible).
>> 
>> The only manual change is to `.jcheck/conf`. All other changes were made by running `find . -type f -iname "*.properties" | xargs gsed -i -e 's/[ \t]*$//'`.
>
> Magnus Ihse Bursie has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - Revert "Remove check for .properties from jcheck"
>    
>    This reverts commit c91fdaa19dc06351598bd1c0614e1af3bfa08ae2.
>  - Change trailing space and tab in values to unicode encoding

Trailing spaces in `LocaleNames_*` are only in two files:

- `src/jdk.localedata/share/classes/sun/util/resources/ext/LocaleNames_de.properties`
- `src/jdk.localedata/share/classes/sun/util/resources/ext/LocaleNames_sv.properties`

It is very unlikely these spaces are part of a country or language name. The former file contains a few trailing spaces, the latter — only one.

src/jdk.localedata/share/classes/sun/util/resources/ext/LocaleNames_de.properties line 238:

> 236: cpp=Kreolisch-Portugiesische Sprache
> 237: crh=Krimtatarisch
> 238: crp=Kreolische Sprache\u0020

I'm pretty sure locale names shouldn't contain trailing spaces.

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Marked as reviewed by aivanov (Reviewer).

PR: https://git.openjdk.org/jdk/pull/10792