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Followup to #79984

The goal here is to allow the DIagService to do all up front work on the host, then as soon as possible make the call over to OOP to do all the actual work. This ensures that we avoid undesirable work (like making Compilations or CompilationWithAnals) on the host side, and do all compilation/semantic work on the OOP side.

includeNonLocalDocumentDiagnostics,
includeProjectNonLocalResult,
cancellationToken);
}
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this method will now be the one that ccan call over to oop immeidately. we had to do some in-memory processing before calling it (specifically because lambdas are passed in), so we need to still do that on the host side. but none of that involves compilations, and we can now remote this call entirely over, and have the remote side call into this.

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@dotnet/roslyn-ide ptal.

@CyrusNajmabadi CyrusNajmabadi merged commit 5b036d0 into dotnet:main Aug 20, 2025
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@CyrusNajmabadi CyrusNajmabadi deleted the diagRefactoring branch August 20, 2025 22:16
@dotnet-policy-service dotnet-policy-service bot added this to the Next milestone Aug 20, 2025
JoeRobich added a commit to dotnet/roslyn-tools that referenced this pull request Aug 29, 2025
46 PRs before and 36 after
```diff
+    * [Cache diagnostic analyzer computation](dotnet/roslyn#80045)
+    * [Remove parameter always passed the same value](dotnet/roslyn#80042)
     * [Update doc for IMethodSymbol.IsExtensionMethod](dotnet/roslyn#80016)
     * [Don't cache known-broken compositions](dotnet/roslyn#80021)
     * [Cleanup methods in DiagAnalyzerService](dotnet/roslyn#80013)
     * [Simplify processing of errors reported by the build](dotnet/roslyn#79964)
     * [Additional cleanup of the DiagnosticAnalyzerServier](dotnet/roslyn#80005)
     * [Fix Code Lens around source generated files](dotnet/roslyn#79992)
     * [Remove superflous DiagService api that can be achieved with existing apis](dotnet/roslyn#80007)
     * [Generate `init` accessor for required properties inside `readonly struct`s](dotnet/roslyn#80004)
     * [Remove existing low level diag oop code now that it's all handled at higher levels.](dotnet/roslyn#79994)
     * [Allow large InlineHint ArrayBuilder pooling](dotnet/roslyn#79857)
     * [Reduce allocations obtaining classified spans in ClassifierHelper](dotnet/roslyn#79856)
     * [Compute span diagnostics in oop](dotnet/roslyn#79991)
     * [Allow Razor cohosting to work with non-Razor SDK projects](dotnet/roslyn#79953)
     * [Move computation of deprioritized analyzers to oop](dotnet/roslyn#79989)
     * [EnC: Fix symbol mapping of delegates with indexed name](dotnet/roslyn#79837)
     * [Emit telemetry 'durations' with known radix point '.'](dotnet/roslyn#79988)
     * [Move logic up into DiagService](dotnet/roslyn#79985)
     * [Move the StateManager type up to the DiagnosticService from the DiagnosticIncrementalANalyzer](dotnet/roslyn#79984)
     * [Immediately remote diagnostics call to OOP](dotnet/roslyn#79983)
     * [Build Microsoft.CodeAnalysis.SemanticSearch.Extension ref assembly for use in semantic search queries](dotnet/roslyn#79972)
     * [Only cache compilation if we have the same set of analyzers](dotnet/roslyn#79978)
     * [Delete unused property](dotnet/roslyn#79963)
     * [Update 'use expr body' to be a purely syntactic analyzer](dotnet/roslyn#79979)
     * [Mark 'Use expr body' as a syntax-only fixer](dotnet/roslyn#79971)
     * [♻️ MSBuildWorkspaceDirectory - Fallback to AppContext.BaseDirectory when Assembly Location is empty](dotnet/roslyn#79934)
     * [Merge runtime async support into main](dotnet/roslyn#79833)
     * [Implement "Simplify property accessor" feature](dotnet/roslyn#79754)
-    * Merge main to runtime async branch (PR: [#79961](dotnet/roslyn#79961))
     * [Redo how and when we report source generator telemetry](dotnet/roslyn#79951)
     * [Allow MEF components to supply assembly path resolvers](dotnet/roslyn#79218)
     * [Allow Razor to hook up the source generator in misc files](dotnet/roslyn#79891)
     * [Block ENC for extension blocks](dotnet/roslyn#79883)
     * [Upgrade servicehub.client to fix test source discovery](dotnet/roslyn#79899)
     * [Update package restore error message.](dotnet/roslyn#79876)
-    * Merge main (PR: [#79834](dotnet/roslyn#79834))
-    * Merge main (PR: [#79830](dotnet/roslyn#79830))
     * [Baseline struct lifting tests](dotnet/roslyn#79505)
-    * Merge main to runtime async branch (PR: [#79582](dotnet/roslyn#79582))
-    * Merge main (PR: [#79424](dotnet/roslyn#79424))
-    * Merge main (PR: [#78994](dotnet/roslyn#78994))
-    * Merge main to runtime async branch (PR: [#78740](dotnet/roslyn#78740))
-    * Merge main to runtime async branch (PR: [#78517](dotnet/roslyn#78517))
-    * Merge main to runtime async branch (PR: [#78114](dotnet/roslyn#78114))
-    * Merge main to runtime async branch (PR: [#77700](dotnet/roslyn#77700))
-    * Merge main to runtime async branch (PR: [#77533](dotnet/roslyn#77533))
-    * Merge main to runtime async branch (PR: [#77265](dotnet/roslyn#77265))
```
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