Statement on first line in top-level statements file is treated incorrectly when partial class Program definition is present

[just-ero]

Environment

VS Code version: 1.95.2, e8653663e8840adaf45af01eab5c627a5af81807, x64
C# Extension version: v2.55.21

Steps to reproduce

1. Create or open any C# project.
2. Open or create a top-level statements (Program.cs) file.
3. Add the following code:

   int i;
   
   partial class Program;

4. Observe int i; being treated incorrectly; it is "folded away":
   

Expected Behavior

The statement on the first line is not treated incorrectly like this.

Actual Behavior

The statement is in an extra "container", navigating to the line with the cursor hides the cursor behind that container. The contents of the line can still be edited. Clicking the container does not yield a response.

[just-ero]

To add a use-case for a partial class Program definition in a top-level statements file: it allows for defining (partial) members that can be used in the top-level code:

// ...

partial class Program
{
    [GeneratedRegex(@"...")]
    private partial Regex MyRegex { get; }
}

[JoeRobich]

documentSymbols response from the repro code.

[Trace - 3:43:50 PM] Received response 'textDocument/documentSymbol - (3888)' in 2ms.
Result: [
    {
        "glyph": 7,
        "children": [
            {
                "glyph": 51,
                "children": [],
                "name": "<Main>$",
                "detail": "<top-level-statements-entry-point>",
                "kind": 6,
                "range": {
                    "start": {
                        "line": 0,
                        "character": 0
                    },
                    "end": {
                        "line": 3,
                        "character": 0
                    }
                },
                "selectionRange": {
                    "start": {
                        "line": 0,
                        "character": 0
                    },
                    "end": {
                        "line": 3,
                        "character": 0
                    }
                }
            }
        ],
        "name": "Program",
        "detail": "Program",
        "kind": 5,
        "range": {
            "start": {
                "line": 2,
                "character": 0
            },
            "end": {
                "line": 2,
                "character": 22
            }
        },
        "selectionRange": {
            "start": {
                "line": 2,
                "character": 14
            },
            "end": {
                "line": 2,
                "character": 21
            }
        }
    }
]

Testing with a class name other than Program.

for example:

int i;

partial class Test;

The response is

[Trace - 3:55:28 PM] Received response 'textDocument/documentSymbol - (7764)' in 14ms.
Result: [
    {
        "glyph": 7,
        "children": [],
        "name": "Test",
        "detail": "Test",
        "kind": 5,
        "range": {
            "start": {
                "line": 2,
                "character": 0
            },
            "end": {
                "line": 2,
                "character": 19
            }
        },
        "selectionRange": {
            "start": {
                "line": 2,
                "character": 14
            },
            "end": {
                "line": 2,
                "character": 18
            }
        }
    }
]

Program being "special" brings along the <Main>$: <top-level-statements-entry-point> symbol which isn't entirely useful here even if it is correct.

On a tangential note, I can see how it would be nice to include local functions in the documentSymbols, especially for top-level statements.

[JoeRobich]

Thinking about this more, the <Main>$: <top-level-statements-entry-point> symbol is correct. The problem here is the range of the Program symbol which should be the entire document.

[JoeRobich]

Tested this in VS proper and there are no issues with Sticky Scroll. My hunch is that VS Code is using a combination of documentSymbol and foldingRange for their sticky scroll.