RFR: 8295729: Add jcheck whitespace checking for properties files

[Magnus Ihse Bursie]

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]*$//'`.

Okay. That definitely rules out adding .properties to the whitespace jcheck verification.

However, I think that instead opens up a ton of more individual problems, since I think most (if perhaps not all) of these trailing whitespaces are incidental, and thus might be bugs. Perhaps no-one really noticed a double whitespace where it were not supposed to be, etc, especially not if it was just for a translated language.

I'm thinking I should redirect this PR to skip the jcheck requirement, and revert all changes to property values, but keep the part of the patch that removes trailing spaces in `#` comment lines. That seems to account for a majority of the changes.

For the remaining properties files with trailing spaces in the actual values, I'll make a sanity check if it seems correct or not, and if it looks fishy, I'll open bugs on the respective component teams to verify that their property values are indeed correct.

Does that sound reasonable?

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