Bug: Codex Desktop on Windows leaves Chinese IME underline stuck after switching to ENG

Summary

In Codex Desktop on Windows, Chinese text in the chat composer can remain underlined as if it is still in IME composition, even after switching the Windows input indicator to ENG. This makes the composer look like the composition state did not end correctly.

Environment

• App: Codex Desktop
• App version: 26.602.4764.0
• Package: OpenAI.Codex_26.602.4764.0_x64__2p2nqsd0c76g0
• OS: Windows Home China, build 22621
• Input method: Chinese IME, then switched to ENG

Steps to reproduce

1. Open Codex Desktop on Windows.
2. Click the chat composer.
3. Switch to a Chinese IME and type Chinese text.
4. Switch the Windows input indicator to ENG.
5. Observe the already typed Chinese text in the composer.

Expected behavior

After switching away from the Chinese IME / ending composition, the text should be committed normally and the composition underline should disappear.

Actual behavior

The Chinese text remains underlined in the composer even while the system input indicator shows ENG, suggesting that the composer keeps a stale IME composition/underline state.

Impact

This is confusing for Chinese users because the input looks like it is still being composed or not fully committed, even after switching to English input. It may be related to the IME/composer focus issues reported in #26369, #26494, and #23440, but this specific reproduction is on Windows Desktop and the visible symptom is a stuck underline after switching to ENG.

Workarounds observed

Refocusing the composer, cutting/pasting the text back, or restarting Codex may clear the state, but the underline can persist during normal typing.