Stabilize ReSharper test discovery/build

Author: johnml1135

.vscode/extensions.json

@@ -15,7 +15,8 @@
     "atlassian.atlassian-vscode"
   ],
   "unwantedRecommendations": [
-    // This workspace is ReSharper-first; C# Dev Kit is discouraged.
-    "ms-dotnettools.csdevkit"
+    // This workspace is ReSharper-first; dotnet test providers are discouraged.
+    "ms-dotnettools.csdevkit",
+    "ms-dotnettools.csharp"
   ]
 }

.vscode/settings.json

@@ -74,6 +74,10 @@
   "dotnet.preferCSharpExtension": true,
   "dotnet.automaticallyBuildProjects": false,
   "resharper.solution.autoOpenLastSolution": true,
+  "resharper.build.useResharperBuild": false,
+  "resharper.build.restorePackagesOnBuild": true,
+  "resharper.build.smartNugetRestore": true,
+  "resharper.build.customMsbuildPath": "C:\\Program Files\\Microsoft Visual Studio\\2022\\Community\\MSBuild\\Current\\Bin\\amd64\\MSBuild.exe",
   // Git Graph extension settings
   "git-graph.dialog.merge.noFastForward": false,
   "git-graph.dialog.merge.squashCommits": false,

Directory.Build.props

@@ -35,6 +35,12 @@
 		<!-- Default all managed projects to x64 unless explicitly overridden -->
 		<PlatformTarget Condition="'$(PlatformTarget)' == ''">x64</PlatformTarget>
 		<Platforms Condition="'$(Platforms)' == ''">x64</Platforms>
+		<!--
+			ReSharper test/build controller can invoke SDK-style net48 projects with RuntimeIdentifier=win-x64.
+			If restore only produced net48 (no RID graph), ResolvePackageAssets fails with NETSDK1005/NETSDK1047.
+			Restore win-x64 runtime targets by default so both plain net48 and net48/win-x64 builds succeed.
+		-->
+		<RuntimeIdentifiers Condition="'$(MSBuildProjectExtension)' == '.csproj' and '$(RuntimeIdentifiers)' == ''">win-x64</RuntimeIdentifiers>
 		<!-- Force 64-bit MSBuild host to avoid crashes loading 64-bit native DLLs in build tasks -->
 		<PreferredToolArchitecture>x64</PreferredToolArchitecture>
 		<!-- Disable determinism to allow wildcard versions in CommonAssemblyInfo.cs -->

Docs/core-developer-setup.md

@@ -123,7 +123,7 @@ git checkout release/9.3
 
 Recommended VS Code extensions for daily development:
 - **ReSharper for VS Code** (`jetbrains.resharper-code`) for C# editing, navigation, refactoring, and test explorer
-- **C# Dev Kit** (`ms-dotnettools.csdevkit`) is discouraged in this workspace
+- **C# Dev Kit** (`ms-dotnettools.csdevkit`) and **C#** (`ms-dotnettools.csharp`) are discouraged in this workspace
 - **C/C++** (`ms-vscode.cpptools`) for native editing/debugging
 - **PowerShell** (`ms-vscode.powershell`) for build/test scripts
 

Docs/vscode-stability-profile.md

@@ -5,7 +5,7 @@ This repository is a mixed native + managed solution (C++ + .NET Framework `net4
 ## Supported inner-loop in VS Code
 
 - Use ReSharper for VS Code (`jetbrains.resharper-code`) as the default C# experience in VS Code.
-- C# Dev Kit (`ms-dotnettools.csdevkit`) is discouraged in this workspace.
+- C# Dev Kit (`ms-dotnettools.csdevkit`) and C# (`ms-dotnettools.csharp`) are discouraged in this workspace.
 - Use `ms-vscode.cpptools` for C/C++ editing and IntelliSense.
 - Build and test through repo scripts/tasks:
   - `./build.ps1`
@@ -15,6 +15,11 @@ This repository is a mixed native + managed solution (C++ + .NET Framework `net4
 
 - `dotnet.preferCSharpExtension=true` avoids activating C# Dev Kit as the default C# experience.
 - `dotnet.automaticallyBuildProjects=false` avoids background build churn/conflicts in large mixed-language solutions.
+- ReSharper build settings in `.vscode/settings.json` are pinned for stability:
+  - `resharper.build.useResharperBuild=false` (delegates full build to MSBuild.exe)
+  - `resharper.build.restorePackagesOnBuild=true`
+  - `resharper.build.smartNugetRestore=true`
+  - `resharper.build.customMsbuildPath` points to `...\\MSBuild\\Current\\Bin\\amd64\\MSBuild.exe`
 
 ## Test/build authority