CSharpLanguageServer._open_solution_and_projects scanned the whole
repository root and opened every .csproj it found, without consulting
the project's ignore settings.
On repositories that vendor third-party or sample C# projects this
opens projects the language server cannot restore. The cost is paid on
every server start, and the resulting restore failures bury the
diagnostics of the projects the user actually works on. Measured on an
Unreal Engine source tree: 245 projects opened, 53 of them under
Engine/Source/ThirdParty, which Roslyn cannot build; each restart
emitted thousands of NuGet advisory lines and ended in
`The "Csc" task could not be initialized`.
SolidLanguageServer.is_ignored_path already implements exactly this
check, and CSharpLanguageServer already overrides is_ignored_dirname,
so the ignore settings were being honoured everywhere except here.
This applies the existing check at project discovery.
ignore_unsupported_files=False is required because a .csproj is not
itself a C# source file, and would otherwise be excluded on file type
rather than by the ignore patterns.
Co-authored-by: Claude Opus 5 <noreply@anthropic.com>
Co-authored-by: Dr. Dominik Jain <dominik.jain@oraios-ai.de>
