On Wed, 15 Apr 2026 10:21:53 GMT, Thiago Milczarek Sayao <[email protected]> 
wrote:

> `GetStringUTFChars` returns a modified UTF-8 string  that encodes 
> supplementary characters differently from standard UTF-8, so emojis may not 
> be handled as expected by GTK or other Linux desktop components that expect 
> standard UTF-8.
> 
> See:
> https://www.oracle.com/technical-resources/articles/javase/supplementary.html
> https://www.javathinking.com/blog/what-is-the-java-s-internal-represention-for-string-modified-utf-8-utf-16/
> 
> There are other places where `GetStringUTFChars` is used, such as in the file 
> open dialog, but it’s unclear whether this is affected in any real user 
> scenarios.
> 
> Using the sample from the bug report with this fix:
> <img width="778" height="574" alt="image" 
> src="https://github.com/user-attachments/assets/6a66a746-2239-465d-ad5f-688933deb537";
>  />
> 
> 
> ---------
> - [x] I confirm that I make this contribution in accordance with the [OpenJDK 
> Interim AI Policy](https://openjdk.org/legal/ai).

LGTM

-------------

Marked as reviewed by lkostyra (Reviewer).

PR Review: https://git.openjdk.org/jfx/pull/2150#pullrequestreview-4114595187

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