RFR: 8332895: Support interpolation for backgrounds and borders [v30]

[Michael Strauß]

On Thu, 5 Sep 2024 20:29:17 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

>> I've added tests for a `null` argument, as well as for an unsupported type for the `BORDER_IMAGE_SOURCE` and `BACKGROUND_IMAGE` mappings.
>> 
>> As for your third bullet point, I think you mean `convert` and not `convertBack`. You can only pass "wrong" things into the former, not the latter method. While more tests for `convert` would be good, they shouldn't be done as part of this PR since it is unrelated code.
>
> you are probably right.  I was thinking of a rather contrived case like
> 
> 
>     void wrong() {
>         SubPropertyConverter c = (SubPropertyConverter)converter;
>         c.convertBack(new Object());
>     }
> 
> 
> my question about _documenting_ nullability still stands though.

I've added the appropriate javadoc documentation for that.

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PR Review Comment: https://git.openjdk.org/jfx/pull/1522#discussion_r1746144798