The bug

You're not able to use Ctrl+Home or Ctrl+End to jump to the beginning/end of a text while editing a book and quill, like you're able to in most text editors. Instead, it has the same effect as just pressing "Home" or "End", respectively.

This might be working as intended.

To reproduce

1. Get a book and quill
2. Write something in it that spans multiple rows
3. Move your cursor into the middle of the text
4. Press Ctrl+Home
5. You're just at the beginning of the line you're currently in, not the beginning of the entire text
6. Press Ctrl+End
7. You're just at the end of the line you're currently in, not at the end of the entire text