If screen is locked with Code in focus, on unlock I can't select any text

### What Happened?

Double-tapping and dragging with the touchpad or pressing Shift+ArrowKeys moves the cursor around instead of selecting the text.

### Steps to Reproduce

1. Open code and start editing a file.
2. With Code still in focus, lock the screen — it should turn off.
3. Wake the screen and unlock your session. Code should be focused.
4. Try to select any text on the document you've opened.

To recover the functionality, switch focus to another app and return to Code (e.g. Alt+Tab).

### Expected Behavior

Text selection should work.

As far as I know, other apps that frequently contain text or forms (e.g. Firefox, Thunderbird) don't exhibit this problem.

### OS Version

8.x (Circe)

### OS Architecture

amd64 (on most hardwares)

### Session Type

Secure Session (Wayland, This is the default)

### Software Version

Latest release (I have run all updates)

### Log Output

```shell

```

### Hardware Info

- Dell Inspiron 15 3583 (laptop)
- Intel graphics

この issue にはソースファイル、テスト、エントリポイントが記載されていません。まず、Wayland セッションでロックしてからロック解除した後に Code でフォーカスとテキスト選択が失敗する問題を再現します。タッチパッドでのドラッグと Shift+ArrowKeys によって、別のアプリケーションに切り替えずにテキストを選択できれば完了です。

索引モデルが issue の本文から書いたものです。