When moving code from class A to class B that extends A the server shows duplicate function error.

When refactoring code, it seems like something are not getting picked up when moved from one file to another. It will cause an error saying that the moved function is defined in two places.

Maybe add the ability to restart or refresh the language server without having to restart the editor, or have the plugin pick up these changes.

```python
# BaseClass.gd
extends Node2D
class_name BaseClass

func _read():
_a()

func _a():
pass
```

```python
# BaseClass.gd
extends Node2D
class_name BaseClass
# Base class functions

# ChildClassA.gd
extends BaseClass
class_name ChildClassA

func _read():
_a()

func _a():
pass
```