No "null check" code actions are available for method's arguments of nullable ref type

[tvardero]

Issue Description

Code refactor is provided for non-nullable reference types in method arguments, containing suggestions to add null checks:

They are not provided for nullable reference types:

Environment information

VSCode version: 1.70.2 C# Extension: 1.25.0

Dotnet Information

.NET SDK (reflecting any global.json): Version: 6.0.303 Commit: 7494fee64a

Runtime Environment: OS Name: Windows OS Version: 10.0.19044 OS Platform: Windows RID: win10-x64 Base Path: C:\Program Files\dotnet\sdk\6.0.303\

global.json file: Not found

Host: Version: 6.0.8 Architecture: x64 Commit: 55fb7ef977

.NET SDKs installed: 3.1.422 [C:\Program Files\dotnet\sdk] 6.0.108 [C:\Program Files\dotnet\sdk] 6.0.300 [C:\Program Files\dotnet\sdk] 6.0.303 [C:\Program Files\dotnet\sdk]

.NET runtimes installed: Microsoft.AspNetCore.App 3.1.25 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 3.1.28 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 6.0.5 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 6.0.8 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.NETCore.App 3.1.25 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.NETCore.App 3.1.28 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.5 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.8 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.WindowsDesktop.App 3.1.25 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App] Microsoft.WindowsDesktop.App 3.1.28 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App] Microsoft.WindowsDesktop.App 6.0.5 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App] Microsoft.WindowsDesktop.App 6.0.8 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

Download .NET: https://aka.ms/dotnet-download

Learn about .NET Runtimes and SDKs: https://aka.ms/dotnet/runtimes-sdk-info

Visual Studio Code Extensions

Extension	Author	Version
csharp	ms-dotnettools	1.25.0
gitlens	eamodio	12.1.2
user-secrets	adrianwilczynski	2.0.1
vsc-material-theme	Equinusocio	33.5.0
vsc-material-theme-icons	equinusocio	2.3.1
vscode-eslint	dbaeumer	2.2.6
vscode-nuget-gallery	patcx	0.0.24
vscode-pull-request-github	GitHub	0.48.1
vscode-solution-explorer	fernandoescolar	0.5.0