RFR: JDK-8297413: Remove easy warnings in javafx.graphics [v4]

[Nir Lisker]

On Mon, 5 Dec 2022 20:17:04 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

>> I do agree with @kevinrushforth here.
>> 
>> It might be borderline useful to enable the warning once just to see if there are any bugs or perhaps to clean up the most obvious cases, but it probably makes little sense to enable the said warning for large and long lived code bases like this one.
>
> just to clarify:
> 1. I am ok with this code change, the typecast is unnecessary
> 2. I agree with Kevin that this particular warning (unnecessary cast) is of little value, especially in the large and long lived code bases.

I wrote what I think in [this comment](https://github.com/openjdk/jfx/pull/960#issuecomment-1325782856). Even if in this specific case the cast should not be changed, the warning is very useful to have since it encapsulates non-numeric types as well.

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PR: https://git.openjdk.org/jfx/pull/960