Add .NET 11 Preview 3 release notes draft

release-notes/11.0/preview/preview3/README.md

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+# .NET 11 Preview 3 - Release Notes
+
+These notes cover the highest-value changes that shipped in .NET 11 Preview 3:
+
+- [Libraries](./libraries.md)
+- [Runtime](./runtime.md)
+- [SDK](./sdk.md)
+
+## Languages
+
+- [C#](./csharp.md)
+
+## Web and data
+
+- [ASP.NET Core](./aspnetcore.md)
+- [EF Core](./efcore.md)
+
+## Release information
+
+| | Version |
+| --- | --- |
+| Runtime | 11.0.0-preview.3.26179.102 |
+| SDK | 11.0.100-preview.3.26179.102 |
+
+### VMR refs
+
+These release notes were generated from the [dotnet/dotnet](https://github.com/dotnet/dotnet) VMR:
+
+- **Base**: [`v11.0.0-preview.2.26159.112`](https://github.com/dotnet/dotnet/tree/v11.0.0-preview.2.26159.112)
+- **Head**: [`release/11.0.1xx-preview3`](https://github.com/dotnet/dotnet/tree/release/11.0.1xx-preview3)
+
+## Get Started
+
+Instructions on getting started with .NET 11 can be found in the
+[getting started guide](../../get-started.md). Installers and binaries for
+.NET 11 Preview 3 are available from
+[dotnet.microsoft.com](https://dotnet.microsoft.com/download/dotnet/11.0) and
+[.NET 11 Releases](../../README.md).
+
+## Stay up to date
+
+You can find a broader overview of .NET 11 here:
+
+- [What's new in .NET 11](https://learn.microsoft.com/dotnet/core/whats-new/dotnet-11/overview)
+- [What's new in ASP.NET Core for .NET 11](https://learn.microsoft.com/aspnet/core/release-notes/aspnetcore-11)
+- [What's new in EF Core 11](https://learn.microsoft.com/ef/core/what-is-new/ef-core-11.0/whatsnew)
+
+The latest .NET 11 release is always available at
+[dotnet.microsoft.com](https://dotnet.microsoft.com/download/dotnet/11.0) and
+[.NET 11 Releases](../../README.md).

release-notes/11.0/preview/preview3/aspnetcore.md

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+# ASP.NET Core in .NET 11 Preview 3 - Release Notes
+
+.NET 11 Preview 3 includes new ASP.NET Core features and improvements:
+
+- [Zstandard response compression and request decompression](#zstandard-response-compression-and-request-decompression)
+- [Virtualize adapts to variable-height items at runtime](#virtualize-adapts-to-variable-height-items-at-runtime)
+- [HTTP/3 starts processing requests earlier](#http3-starts-processing-requests-earlier)
+- [Bug fixes](#bug-fixes)
+- [Community contributors](#community-contributors)
+
+ASP.NET Core updates in .NET 11:
+
+- [What's new in ASP.NET Core in .NET 11](https://learn.microsoft.com/aspnet/core/release-notes/aspnetcore-11)
+- [dotnet/aspnetcore #64787](https://github.com/dotnet/aspnetcore/issues/64787)
+
+<!-- Verified against Microsoft.AspNetCore.App.Ref@11.0.0-preview.3.26179.102 -->
+
+## Zstandard response compression and request decompression
+
+ASP.NET Core now supports [Zstandard (zstd)](https://facebook.github.io/zstd/)
+for both response compression and request decompression
+([dotnet/aspnetcore #65479](https://github.com/dotnet/aspnetcore/pull/65479)).
+This adds zstd support to the existing response-compression and
+request-decompression middleware and enables it by default.
+
+```csharp
+var builder = WebApplication.CreateBuilder(args);
+
+builder.Services.AddResponseCompression();
+builder.Services.AddRequestDecompression();
+builder.Services.Configure<ZstandardCompressionProviderOptions>(options =>
+{
+    options.CompressionOptions = new ZstandardCompressionOptions
+    {
+        Quality = 6 // 1-22, higher = better compression, slower
+    };
+});
+```
+
+Thank you [@manandre](https://github.com/manandre) for this contribution!
+
+## Virtualize adapts to variable-height items at runtime
+
+Blazor's `Virtualize<TItem>` component no longer assumes every item has the same
+height. Preview 3 updates it to adapt to measured item sizes at runtime, which
+reduces incorrect spacing and scrolling when item heights vary
+([dotnet/aspnetcore #64964](https://github.com/dotnet/aspnetcore/pull/64964)).
+
+```razor
+<Virtualize Items="messages" Context="message">
+    <article class="message-card">
+        <h4>@message.Author</h4>
+        <p>@message.Text</p>
+    </article>
+</Virtualize>
+```
+
+## HTTP/3 starts processing requests earlier
+
+Kestrel now starts processing HTTP/3 requests without waiting for the control
+stream and SETTINGS frame first, which reduces first-request latency on new
+connections ([dotnet/aspnetcore #65399](https://github.com/dotnet/aspnetcore/pull/65399)).
+
+<!-- Filtered features (significant engineering work, but too niche or already covered elsewhere):
+  - OpenAPI 3.2 support: a real breaking-change story for OpenAPI users, but already documented in Preview 2 and not repeated here.
+  - OpenBSD RID support: welcome platform work, but too narrow for the main ASP.NET Core notes.
+-->
+
+## Bug fixes
+
+- **Blazor**
+  - Fixed a null reference error in `Virtualize`
+    ([dotnet/aspnetcore #65207](https://github.com/dotnet/aspnetcore/pull/65207)).
+  - Fixed scroll-container detection when `overflow-x` is set
+    ([dotnet/aspnetcore #65744](https://github.com/dotnet/aspnetcore/pull/65744)).
+  - Fixed the Web Worker template in published Blazor WebAssembly apps
+    ([dotnet/aspnetcore #65885](https://github.com/dotnet/aspnetcore/pull/65885)).
+  - Fixed TempData lazy loading: `Get`, `Remove`, `Keep`, and enumeration now correctly trigger lazy loading
+    ([dotnet/aspnetcore #65722](https://github.com/dotnet/aspnetcore/pull/65722)).
+  - Fixed `IJSObjectReference` leak in `ResourceCollectionProvider`
+    ([dotnet/aspnetcore #65606](https://github.com/dotnet/aspnetcore/pull/65606)).
+  - Fixed cache headers for the Blazor resource collection endpoint to include `no-transform` and correct `Vary` headers
+    ([dotnet/aspnetcore #65513](https://github.com/dotnet/aspnetcore/pull/65513)).
+- **Data Protection**
+  - Fixed `ManagedAuthenticatedEncryptor` hash calculation and comparison on .NET Framework targets
+    ([dotnet/aspnetcore #65890](https://github.com/dotnet/aspnetcore/pull/65890)).
+- **HTTP / Kestrel**
+  - Fixed HTTP/2 HEADERS frame padding length validation to account for PRIORITY flag bytes
+    ([dotnet/aspnetcore #65729](https://github.com/dotnet/aspnetcore/pull/65729)).
+  - Fixed HTTP/2 Content-Length mismatch with trailers split across CONTINUATION frames
+    ([dotnet/aspnetcore #65765](https://github.com/dotnet/aspnetcore/pull/65765)).
+  - Fixed HPACK/QPACK decoder to validate uncompressed header size limits per `MaxRequestHeaderFieldSize` documentation
+    ([dotnet/aspnetcore #65771](https://github.com/dotnet/aspnetcore/pull/65771)).
+  - Fixed oversized TLS record length handling in `TlsListener` per RFC 8446
+    ([dotnet/aspnetcore #65558](https://github.com/dotnet/aspnetcore/pull/65558)).
+  - Updated `ReasonPhrase` validation for HTTP responses
+    ([dotnet/aspnetcore #65797](https://github.com/dotnet/aspnetcore/pull/65797)).
+- **JSON Patch**
+  - Fixed `JsonPatchDocument` operations on properties within array elements
+    ([dotnet/aspnetcore #65470](https://github.com/dotnet/aspnetcore/pull/65470)).
+- **Middleware**
+  - Fixed output caching freshness check that incorrectly rejected cached entries when the request arrived on the same tick as the cache write
+    ([dotnet/aspnetcore #65659](https://github.com/dotnet/aspnetcore/pull/65659)).
+- **Minimal APIs**
+  - Fixed validation source generator crash when encountering types with indexers like `JsonElement` and `Dictionary`
+    ([dotnet/aspnetcore #65432](https://github.com/dotnet/aspnetcore/pull/65432)).
+- **SignalR**
+  - Fixed cancellation handling with `StatefulReconnect` to be more aggressive
+    ([dotnet/aspnetcore #65732](https://github.com/dotnet/aspnetcore/pull/65732)).
+
+## Community contributors
+
+Thank you contributors! ❤️
+
+- [@am11](https://github.com/dotnet/aspnetcore/pulls?q=is%3Apr+is%3Amerged+milestone%3A11.0-preview3+author%3Aam11)
+- [@DarianBaker](https://github.com/dotnet/aspnetcore/pulls?q=is%3Apr+is%3Amerged+milestone%3A11.0-preview3+author%3ADarianBaker)
+- [@HPOD00019](https://github.com/dotnet/aspnetcore/pulls?q=is%3Apr+is%3Amerged+milestone%3A11.0-preview3+author%3AHPOD00019)
+- [@kasperk81](https://github.com/dotnet/aspnetcore/pulls?q=is%3Apr+is%3Amerged+milestone%3A11.0-preview3+author%3Akasperk81)
+- [@kklocker](https://github.com/dotnet/aspnetcore/pulls?q=is%3Apr+is%3Amerged+milestone%3A11.0-preview3+author%3Akklocker)
+- [@manandre](https://github.com/dotnet/aspnetcore/pulls?q=is%3Apr+is%3Amerged+milestone%3A11.0-preview3+author%3Amanandre)
+- [@martincostello](https://github.com/dotnet/aspnetcore/pulls?q=is%3Apr+is%3Amerged+milestone%3A11.0-preview3+author%3Amartincostello)

release-notes/11.0/preview/preview3/build-metadata.json

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+{
+  "version": "11.0.0-preview.3",
+  "base_ref": "v11.0.0-preview.2.26159.112",
+  "head_ref": "origin/release/11.0.1xx-preview3",
+  "build": {
+    "version": "11.0.0-preview.3.26203.107",
+    "sdk_version": "11.0.100-preview.3.26203.107",
+    "sdk_url": "https://ci.dot.net/public/Sdk/11.0.100-preview.3.26203.107/dotnet-sdk-11.0.100-preview.3.26203.107-{platform}.tar.gz"
+  },
+  "nuget": {
+    "source": "https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet11/nuget/v3/index.json",
+    "packages": {
+      "Microsoft.NETCore.App.Ref": "11.0.0-preview.3.26203.107",
+      "Microsoft.AspNetCore.App.Ref": "11.0.0-preview.3.26203.107",
+      "Microsoft.WindowsDesktop.App.Ref": "11.0.0-preview.3.26203.107",
+      "Microsoft.EntityFrameworkCore": "11.0.0-preview.3.26203.107",
+      "Microsoft.Data.Sqlite.Core": "11.0.0-preview.3.26203.107"
+    }
+  }
+}