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[UIElements] Right side alt-key secondary language keyboard input is ignored on Windows when using UI Elements

UI Toolkit


How to reproduce:
1. Install any CJK language pack on Windows 10 (Korean was used for testing)
2. Open the attached project ("")
3. Open UIElementsExamples > 13_SerializedProperties tab
4. Set your language to the installed CJK of choice
5. Click right alt key (Alt Gr) to change the keyboard layout
6. Try typing into UI Elements string field

Expected results: CJK letters from the alternative keyboard layout are typed
Actual results: English letters are typed

Reproducible with: 2019.1.11f1, 2019.2.0b10, 2019.3.0a10
Couldn't reproduce with version up to 2019.1.0b1 because of project errors after the downgrade

1. This issue does not reproduce with IMGUI fields
2. Not all UI Elements fields reproduce this issue
3. This issue only reproduces on Windows

  1. Resolution Note:

    This seems to be a more general problem with Unity and not specific to UIElements.

    Right now this very low priority for us and we may have a look at this at a later date.

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