C# hover diagnostics can push the method signature below the visible area

Describe the issue

In C# source, hovering a symbol that has diagnostics renders the diagnostics before the symbol's method signature/Quick Info. When the diagnostic section is long, the syntax-highlighted signature is pushed below the visible area and requires vertical scrolling.

The signature is the primary context users need from this hover, so hiding it behind diagnostic content makes IntelliSense harder to use. This appears to be governed by VS Code's hover composition rather than a single C# language-server response, but it should be tracked for the C# experience and coordinated upstream as needed.

Related upstream history: microsoft/vscode#73120 changed long hovers so diagnostics would no longer appear below lengthy documentation. The C# case demonstrates the inverse problem when diagnostics are lengthy.

Collect logs

Not collected. This is a hover layout/content-ordering issue rather than a language-server failure; no relevant error logs are expected.

Steps to reproduce

1. Open a C# file containing a method call or declaration with one or more diagnostics whose text occupies several lines.
2. Hover the affected symbol.
3. Observe that diagnostics are shown first and the method signature is below the initial visible portion of the hover.
4. Scroll vertically to reach the signature.

Expected behavior

The method signature should remain visible without scrolling. Diagnostics could be ordered after it, collapsed, constrained to their own section, or otherwise presented without displacing the signature.

Environment information

Observed while dogfooding C# in VS Code. Exact VS Code and extension versions were not captured in the original report.

Created from a Microsoft Teams conversation.

Reproduce the hover in a C# file in VS Code with diagnostics whose text spans several lines, then inspect how the C# Dev Kit and VS Code compose the hover. Compare the behavior with microsoft/vscode#73120 and coordinate upstream as needed; done means the method signature remains visible without scrolling while diagnostics remain available.