RFR: 8356652: Input field ignores custom input source characters

[Andy Goryachev]

On Wed, 14 May 2025 15:31:46 GMT, Martin Fox <mfox at openjdk.org> wrote:

> Under the hood the Keyman input method appears as a US English keyboard layout. The characters attached to an NSEvent are always US English Roman even if the selected Keyman layout is, say, Hebrew or Dvorak. Keyman sends the correct Hebrew or Dvorak character to insertText:replacementRange: instead.
> 
> This PR special-cases the Keyman layout, detecting it using the same method that AWT does. When Keyman is active Glass records the insertText: character and uses that when sending out KeyEvents.

Noticed a bit of a problem.

To reproduce, install Himyarit Musnad keyboard https://keyman.com/keyboards/himyarit_musnad

typing 'h' causes this character to appear: 𐩱
typing 'n' followed by 'h' generates garbage input rather than expected 𐩱:

![Screenshot 2025-05-15 at 08 51 18](https://github.com/user-attachments/assets/5bf31611-46f9-4417-9720-f485a236c80e)

(I am using the monkey tester, but it will work with any application that uses a TextArea)

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PR Comment: https://git.openjdk.org/jfx/pull/1805#issuecomment-2884330689