Document for URI could not be found: file:///real/path/file.txt


If the file name changes, in the same buffer, every key press triggers an error until you reset neovim. 


```
[Copilot.lua] RPC[Error] code_name = InvalidParams, message = "Document for URI could not be found: 
  file:///redacted/file.txt"
```

This can happen when: 

1. a new file got saved and hence gets a new name
2. user run `:file new-name.txt` 

