RFR: 8345188: Support tree-structural pseudo-classes [v6]

[Michael Strauß]

On Wed, 8 Jan 2025 12:05:56 GMT, John Hendrikx <jhendrikx at openjdk.org> wrote:

>> Michael Strauß has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains seven additional commits since the last revision:
>> 
>>  - Merge branch 'master' into feature/root-pseudo-class
>>  - whitespace error
>>  - add child-indexed pseudo-classes
>>  - add pseudo-class table to Parent
>>  - update cssref
>>  - Set :root pseudo-class on sub-scene root node
>>  - Set :root pseudo-class on root node
>
> modules/javafx.graphics/src/main/docs/javafx/scene/doc-files/cssref.html line 1530:
> 
>> 1528:     <p>In the following example, all background color of all buttons uses the
>> 1529:       looked up color "abc".</p>
>> 1530:     <p class="example">:root { abc: #f00 }<br>
> 
> I see many places where `.root` is removed in favor of `:root`, but both are supported still?  At least, the code in `Scene` leads me to believe that it will also apply the `.root` style class still.  Should this legacy style class be mentioned in the CSS documentation still?

It will still be supported for backwards compatibility, but I see no reason to mention that now that we have the standard-conformant `:root` pseudo-class.

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PR Review Comment: https://git.openjdk.org/jfx/pull/1652#discussion_r1907546471