RFR: 8089913: CSS pseudo classes missing by default for some controls [v5]

[Ajit Ghaisas]

On Fri, 5 Mar 2021 16:07:59 GMT, mstr2 <github.com+43553916+mstr2 at openjdk.org> wrote:

>> The Slider control does not have the ":horizontal" CSS pseudo-class set by default. The pseudo-class is only set once the "orientation" property is changed. This PR fixes that.
>
> mstr2 has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Revert changes to TreeCell, TreeTableRow

Marked as reviewed by aghaisas (Reviewer).

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PR: https://git.openjdk.java.net/jfx/pull/413