Update roslyn to 5.9.0-1.26314.1

[davidwengier]

View Complete Diff of Changes

• Records: Avoid synthesized non-virtual calls to abstract methods (PR: #84101)
• Reduce allocation churn in tag helper context discovery pools (PR: #84123)
• Fix multiline lambda formatting in non-directive attributes (PR: #84121)
• Embed Workspaces.MSBuild.Contracts into the Workspaces.MSBuild NuGet (PR: #84113)
• Document cache contents as a trusted compilation input (PR: #84114)
• Allow multiple host workspaces for PdbMatchingSourceTextProvider (PR: #84094)
• Strengthen NullableWalker.IsSlotMember against NullReferenceException (PR: #84071)
• Allow disposable pooled objects in compiler (PR: #84082)
• Fix file watching leaks for shared server (PR: #84049)
• Fix Razor allowed child validation in code blocks (PR: #84116)
• Add Razor compiler integration tests for most C# features since C# 8 (PR: #83862)
• Adjust telemetry to identify file-based apps with no directives (PR: #84111)
• Use cached mef compositions in language server tests when possible (PR: #84083)
• Add the server name to the LSP initialization result (PR: #84109)
• Fix signature help selecting wrong overload for multiple type parameter extension methods (PR: #84089)
• Fix design-time-builds from out-of-proc nodes returning empty data (PR: #84096)
• Fix ArrayBuilder pool leak in ComputeDeclarationAnalysisData (PR: #84046)
• Exclude all root .md files from CI (PR: #84074)
• Update instructions around PROTOTYPE comments (PR: #84073)
• Increase timeout for Correctness_Analyzers job (PR: #84064)
• Fix mishandling of large embedded C# literals (PR: #84043)
• Unsafe evolution: propagate unsafe context to constructor initializer (PR: #83969)
• Parameterize DartLab templates repository alias (PR: #84037)
• Fix frontmatter syntax in Compiler.instructions.md (PR: #84032)
• Add baseline availability status to HTML completion tooltips (PR: #84054)
• Fix Razor breakpoint placement (PR: #84029)
• Fix a number of helix issues (PR: #84039)
• Use xsd:anyURI type to detect external completion instead of vs:preferredextensions (PR: #84033)
• Add formatting tests for code blocks above markup (PR: #84027)
• Move Razor docs under docs (PR: #84024)
• Add test to demonstrate adding using for inject directives works (PR: #84026)
• Fix incremental build in Microsoft.Build.Tasks.CodeAnalysis.UnitTests (PR: #84016)
• Remove unneeded logging (PR: #84023)
• Convert copilot-instructions to AGENTS.md (PR: #84022)
• SourceMemberMethodSymbol.IsMetadataVirtual should force complete declaring type when queried by a different module (PR: #84013)
• Free pooled objects across cancellation exceptions (PR: #83875)
• Bump Debugger.Contracts to 18.3.0-beta.26277.4 (PR: #84018)
• Enable parallel builds in the LSP when loading projects (PR: #83982)

[Copilot]

Pull request overview

Updates the C# extension’s pinned Roslyn component version to 5.9.0-1.26314.1 and records the upstream Roslyn change list in the project changelog.

Changes:

• Bump the default Roslyn version in package.json to 5.9.0-1.26314.1.
• Add a new 2.144.x changelog entry describing the Roslyn update and notable upstream PRs.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
package.json	Updates the extension’s default Roslyn version to the new build.
CHANGELOG.md	Documents the Roslyn update under the next release section with upstream highlights.

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.