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

[Andy Goryachev]

On Mon, 24 Oct 2022 19:23:04 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

>> 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
>
> src/demo/share/jfc/SwingSet2/resources/swingset_ja.properties line 187:
> 
>> 185: ### Button Demo ###
>> 186: 
>> 187: ButtonDemo.accessible_description=ButtonDemo\u3067\u306F\u3001JButton\u3001JRadioButton\u3001JToggleButton\u304A\u3088\u3073JCheckBox\u306E\u4F7F\u7528\u4F8B\u3092\u7D39\u4ECB\u3057\u307E\u3059\u0020
> 
> trailing whitespace looks unnecessary (accessible description?)

although this is in demo...

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