RFR: 8314683: TextArea: scroll bar size and content padding

[Andy Goryachev]

On Fri, 31 May 2024 21:50:08 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

> Changing certain ScrollBar, ScrollPane, and TextArea sizes from `em` to `px` in modena.css to make them independent of the font size *in that control*.
> 
> After the change, the UI still looks good which can be tested by scaling default font size in a fairly wide range:
> 
> 
> .root { -fx-font-size:100%; }
> 
> 
> Using CSS Playground tool in the Monkey Tester at 50% and 200% font size:
> 
> ![Screenshot 2024-05-31 at 14 48 41](https://github.com/openjdk/jfx/assets/107069028/c41e1500-ccfe-4aa6-b47a-42571f60b335)
> 
> ![Screenshot 2024-05-31 at 14 49 34](https://github.com/openjdk/jfx/assets/107069028/78270097-4ce3-4c3e-8600-aba8d368495c)

I must clarify: ideally, the size of all the UI elements *should* depend on the base font size, but currently does not (and I don't know exactly how to make it so).

And apparently I am wrong about saying that only TextArea has the issue.  Here is a screenshot of an app with the root font size set at 50%, and combo box at 200%:

![Screenshot 2024-06-05 at 08 29 21](https://github.com/openjdk/jfx/assets/107069028/99cc0666-e286-4464-9adc-c31be351a4c6)

It does not look right either, the UI elements should not get scaled in my opinion, only the text.  I'd rather have a consistent size of UI elements in an application.

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PR Comment: https://git.openjdk.org/jfx/pull/1469#issuecomment-2150364599