code completion menu go out of the editor when typing function name

### Tested versions

- reproducible in : v4.6.stable.official [89cea1439], v4.5.1.stable.official [f62fdbde1]

### System information

Godot v4.6.stable - macOS Tahoe (26.2.0) - Multi-window, 1 monitor - Metal (Mobile) - integrated Apple M2 (Apple8) - Apple M2 (8 threads) - 16.00 GiB memory

### Issue description

after a func keyword, the completion go out of the script editor, making it impossible to read it

https://github.com/user-attachments/assets/f9cc4460-7409-46a1-a768-fbfa67e11eb6

https://github.com/user-attachments/assets/2c354d34-27f7-4fc4-ba2f-684fbef36ef1

### Steps to reproduce

- open a script
- write the "func" keyword
- start writing a function name

### Minimal reproduction project (MRP)

reproducible without a MRP, any project work