Wrong edit range for param completions

How are you using the lua-language-server?

NeoVim

Which OS are you using?

Linux

What is the issue affecting?

Completion

Expected Behaviour

For parameters that can either be a single value or a list T|T[], when already in a table, the completion range should not include surrounding curly braces.

Actual Behaviour

The completion edit range provided by lua-language-server for parameters seems to always include the entire parameter, which causes issues when completing params that can be either a single value or a list, for example, T|T[].

Reproduction steps

1. Create test.lua in the test dir with the following content:

   ---@alias my_type 'a'|'b'
   
   ---@param arg my_type|my_type[]
   local function test_func(arg)
     return arg
   end
   

2. Use neovim to edit test.lua
3. Try to call test_func at the end of the file with a list parameter: test_func({ ... })
4. Completions provided by lua-language-server are shown inside the curly braces
5. Selecting one of the completions replaces the whole parameter, including the surrounding curly braces.

https://github.com/user-attachments/assets/d69214e9-b069-4554-b4ab-770e2fb50632

Additional Notes

I have also reported to the blink.cmp but the maintainer thinks that it is a lua-language-server's issue: https://github.com/Saghen/blink.cmp/issues/2179

Log File

No response

Reproduce the issue using the test.lua example and Neovim, focusing on completion edit ranges for a parameter typed as my_type|my_type[]. Trace how the completion range is calculated when the argument is inside curly braces. Done means selecting a completion replaces only the value inside the braces and preserves the surrounding list syntax.