RFR: 8370253: CodeArea: NPE on copy

[Andy Goryachev]

On Tue, 21 Oct 2025 15:38:38 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

> Fixes a missing `null` check in `CodeArea.copy()` when the `syntaxHighlighter` property is set. 
> 
> Also
> - made sure other callers check for null
> - removed dead code

thank you

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PR Comment: https://git.openjdk.org/jfx/pull/1942#issuecomment-3438194320