RFR: 8332895: Support interpolation for backgrounds and borders [v35]

[Michael Strauß]

On Fri, 6 Sep 2024 22:02:04 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

> Not sure if this is related, but I got an exception flipping through the monkey tester pages using this PR's workspace:

Usually, the go-to explanation for this has something to do with different threads accessing the scene graph. Since we're not dealing with other threads here, maybe it is related to [this](https://mail.openjdk.org/pipermail/openjfx-dev/2024-August/048738.html)?

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PR Comment: https://git.openjdk.org/jfx/pull/1522#issuecomment-2334877598