macOS desktop: cmd+A selection is not visibly rendered, but delete clears all text

Summary

In the macOS Codex desktop app, pressing Ctrl+A in the conversation composer appears not to select any text: there is no visible selection highlight. However, the selection is actually active—pressing Delete immediately removes all text in the composer.

Steps to reproduce

1. Enter text in the conversation composer.
2. Press cmd+A.
3. Observe that the text does not appear selected.
4. Press Delete.

Actual behavior

No visible selection is rendered after Ctrl+A, but Delete clears the entire composer contents.

Expected behavior

The whole composer text should visibly show as selected after Ctrl+A, matching the active selection that Delete already acts upon.

Environment

• macOS 26.2 (25C56)
• Local Codex CLI reported version: 0.150.1
• Session logs not attached

Notes

This report describes the observed UI behavior only; the issue may be in selection rendering, focus handling, or an editor integration layer.

Start by reproducing the issue in the macOS desktop conversation composer with the reported cmd+A and Delete sequence. Trace the composer’s selection rendering, focus handling, and editor integration to determine where the active selection stops being displayed. Done means the full composer text visibly highlights after cmd+A while Delete continues to clear it.