Blazor Hybrid Windows publish still copies precompressed .gz and .br assets from referenced RCLs into publish/wwwroot

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
56/100
Issue type
Bug
Clarity
Clearly specified
Activity status
Active
Tech stack
csharp
Domain
build-system

Research direction

Start by tracing GeneratePublishCompressedStaticWebAssets and _PublishStaticWebAssetsPreserveNewest in the publish targets, then compare how the existing ConvertStaticWebAssetsToMauiAssets filtering handles AssetRole="Alternative" assets. Reproduce with a MAUI Blazor Hybrid app that references an RCL and inspect its published wwwroot/_content/<Rcl>/ directory. Done means publishing with CompressionEnabled=false leaves only the uncompressed RCL assets.

Written by the indexing model from the issue text.

Description

area-blazor bug
Description

Blazor Hybrid sets <CompressionEnabled>false</CompressionEnabled> (via Microsoft.AspNetCore.Components.WebView's StaticWebAssets.Groups.targets) because WebViewManager serves static assets locally without HTTP content-encoding negotiation. However, when a Blazor Hybrid app references a Razor class library (ProjectReference), the RCL still builds with CompressionEnabled=true by default and contributes precompressed .gz and .br (AssetRole="Alternative") static web assets to the consuming app's publish manifest.

While https://github.com/dotnet/maui/pull/33917 (for https://github.com/dotnet/maui/issues/33773) filtered AssetRole='Alternative' .gz/.br items out of @(MauiAsset) in ConvertStaticWebAssetsToMauiAssets (fixing Android APKs), it did not remove them from @(StaticWebAsset) / _PublishStaticWebAssetsPreserveNewest. As a result, publishing a Blazor Hybrid app on Windows (MAUI Windows, WPF, or WinForms) still runs GeneratePublishCompressedStaticWebAssets (Brotli) for the RCL and copies redundant .gz and .br files for every RCL asset into publish/wwwroot/_content/<Rcl>/.

Discovered during validation testing in https://github.com/dotnet/aspnetcore/issues/68814#issuecomment-5536899858.

Steps to Reproduce
  1. Create a new MAUI Blazor Hybrid app and a Razor Class Library from templates and reference the RCL: 
    dotnet new maui-blazor -n MauiHybridApp
dotnet new razorclasslib -n MyRcl
dotnet add MauiHybridApp/MauiHybridApp.csproj reference MyRcl/MyRcl.csproj
  2. Publish the MAUI app for Windows: 
    dotnet publish MauiHybridApp/MauiHybridApp.csproj -c Release -f net11.0-windows10.0.19041.0
  3. Inspect MauiHybridApp/bin/Release/net11.0-windows10.0.19041.0/win-x64/publish/wwwroot/_content/MyRcl/.
  4. Expected: Only uncompressed RCL assets (exampleJsInterop.js, MyRcl.<hash>.bundle.scp.css, background.png) are published when CompressionEnabled=false.
  5. Actual: Precompressed .gz and .br files (exampleJsInterop.js.gz, exampleJsInterop.js.br, MyRcl.<hash>.bundle.scp.css.gz, MyRcl.<hash>.bundle.scp.css.br) are also copied into publish/wwwroot/_content/MyRcl/.
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