RFR: JDK-8293776 : Adds CSS 4 and 8 digits hex coded Color [v6]

[Alexey Ivanov]

On Fri, 23 Sep 2022 03:33:06 GMT, ScientificWare <duke at openjdk.org> wrote:

> With this change, the code is more concise but we double the number of tests ?

For a rather rare case. I don't think it's a critical path which affects performance.

If you like, you can create a variable to store the result of `n == 4` to avoid testing once again. I still don't think it's worth it.

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PR: https://git.openjdk.org/jdk/pull/10317