RFR: 8295729: Remove trailing whitespace from non-value lines in properties files [v2]

[Naoto Sato]

On Fri, 21 Oct 2022 08:17:46 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:
> 
>  - Remove check for .properties from jcheck
>  - Restore trailing whitespace for property values

One possible solution to this is to replace those dangling white spaces with explicit Unicode escapes, i.e. "\u0009" and "\u0020".  This way jcheck can safely be enabled to detect future unwanted trailing spaces, and possibly existing ones can be visually recognizable by the engineers to correct them.

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