`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). ------------- Commit messages: - 8382165: Emojis used in Stage.setTitle are not rendered and break application switching on Linux platform - 8382165: Emojis used in Stage.setTitle are not rendered and break application switching on Linux platform Changes: https://git.openjdk.org/jfx/pull/2150/files Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=2150&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8382165 Stats: 30 lines in 3 files changed: 28 ins; 0 del; 2 mod Patch: https://git.openjdk.org/jfx/pull/2150.diff Fetch: git fetch https://git.openjdk.org/jfx.git pull/2150/head:pull/2150 PR: https://git.openjdk.org/jfx/pull/2150
