RFR: 8295729: Add jcheck whitespace checking for properties files

[Andy Goryachev]

On Thu, 20 Oct 2022 11:58:58 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]*$//'`.

I would vote against this change.  Per java properties spec
https://github.com/openjdk/jdk/pull/10792


White space following the property value is not ignored, and is treated as part of the property value.


This change might break localization or messages where trailing whitespace is important (example: "Label: ")

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