Summary

This PR extends the "Fill all fields" feature (Ctrl+Shift+Enter) to work with GraphQL query arguments that accept input object types. Previously, this feature only worked for query fields with selection sets.

Problem

When users placed their cursor inside an argument object and pressed Ctrl+Shift+Enter, nothing would happen:

{
  withGOTCharacter(character: { })
                           # ^ Ctrl+Shift+Enter did nothing here
}

This was mentioned in the issue comments: "Oh it does not work for arguments. Only query fields"

Solution

The implementation adds a separate code path for handling argument objects while preserving the existing field selection behavior:

Before:

{
  withGOTCharacter(character: { })
}

After pressing Ctrl+Shift+Enter inside the braces:

{
  withGOTCharacter(character: {
    id: 
    book: {
      id: 
      url: 
      name: 
      authors: 
      characters: 
      released: 
    }
    spouse: 
    allegiances: 
  })
}

Implementation Details

Core Changes

1. Token Detection: Distinguishes between cursor in a field's SelectionSet vs. cursor in an argument's ObjectValue
2. Query Parsing: Arguments don't require stripping empty braces (valid GraphQL), unlike fields
3. Field Generation: Added buildInputObjectFields() function that:
   • Recursively generates fields for nested input objects
   • Properly unwraps NonNull and List type wrappers
   • Respects the existing addQueryDepthLimit setting

Enhanced User Experience

• Added autocomplete suggestion when cursor is inside argument objects
• Works consistently with the existing field autofill behavior
• Same keyboard shortcut (Ctrl+Shift+Enter) for both use cases

Files Changed

• fillFields.ts: Core autofill logic with new argument handling
• fillFields.spec.ts: Test coverage for argument autofill
• gql-extensions.ts: Autocomplete integration for arguments
• autofill-fields-at-cursor.md: Updated documentation with examples

Testing

• ✅ Added unit test for argument object field generation
• ✅ Passed CodeQL security check (0 alerts)
• ✅ No breaking changes to existing field autofill functionality

Benefits

• Significantly faster query writing for complex input types
• Consistent keyboard shortcuts across fields and arguments
• Respects user preferences (addQueryDepthLimit setting)
• Improved developer experience when working with mutations and complex queries

Closes #[issue-number]

Fixes #1751

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