Selected text is invisible under Dark High Contrast theme.

What version of the IDE extension are you using?

26.818.61809

What subscription do you have?

Plus

Which IDE are you using?

VS Code

What platform is your computer?

Linux, Plasma, Wayland

What issue are you seeing?

Selected text should become black, but it seems that the selection only changes the background colour.

https://github.com/user-attachments/assets/b6ec9106-a600-4041-8314-5a2773c9f8b5

What steps can reproduce the bug?

Set the IDE theme to Dark High Contrast, and select some text.

What is the expected behavior?

Black text on white background.

Additional information

Below is how VS Code's own "Chat" panel works. Codex should have worked this way.

https://github.com/user-attachments/assets/27cdabab-96bf-4e14-a24a-e20f86ff26c1