RFR: JDK-8294680: Refactor scaled border rendering [v3]

[Alexey Ivanov]

On Mon, 12 Dec 2022 20:43:39 GMT, Rajat Mahajan <duke at openjdk.org> wrote:

>> @rajamah In-order to paint the border even when g is not a Graphics2D object I have added the `resetTransform` check here again and additionally to keep the if & else block close-by, which is easier to understand rather than having the blocks separated.
>
> sure, makes sense. Thanks

Still, I think it makes sense to combine this block with the above one.

If `resetTransform` is true, the transform is reset and variables are set to the values as calculated in this block; otherwise, the variables are initialised with the default values.

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PR: https://git.openjdk.org/jdk/pull/11571