Fix MAUI static asset updates (#47431)

Author: tmat

src/BuiltInTools/dotnet-watch/DotNetWatch.targets

@@ -70,7 +70,7 @@ Returns: @(Watch)
       <!-- In RazorSDK (Blazor, RCL, and Web) targeting apps also watch content files under wwwroot -->
       <Watch Include="%(Content.FullPath)"
              Condition="'$(UsingMicrosoftNETSdkRazor)'=='true' AND '$(DotNetWatchContentFiles)'!='false' AND '%(Content.Watch)' != 'false' AND $([System.String]::Copy('%(Identity)').Replace('\','/').StartsWith('wwwroot/'))"
-             StaticWebAssetPath="$(_DotNetWatchStaticWebAssetBasePath)$([System.String]::Copy('%(Identity)').Replace('\','/').Substring(8))" />
+             StaticWebAssetPath="$(_DotNetWatchStaticWebAssetBasePath)$([System.String]::Copy('%(Identity)').Replace('\','/'))" />
 
       <_WatchProjects Include="%(ProjectReference.Identity)" Condition="'%(ProjectReference.Watch)' != 'false' and Exists('%(Identity)')" />
     </ItemGroup>

test/dotnet-watch.Tests/HotReload/ApplyDeltaTests.cs

@@ -441,7 +441,8 @@ public async Task Razor_Component_ScopedCssAndStaticAssets()
 
             await App.AssertOutputLineStartsWith("dotnet watch 🔥 Hot reload change handled");
 
-            App.AssertOutputContains($"dotnet watch ⌚ Sending static asset update request to browser: 'app.css'.");
+            // "wwwroot" directory is required for MAUI. Web sites work with or without it.
+            App.AssertOutputContains($"dotnet watch ⌚ Sending static asset update request to browser: 'wwwroot/app.css'.");
             App.AssertOutputContains($"dotnet watch 🔥 Hot reload of static files succeeded.");
             App.AssertOutputContains(MessageDescriptor.NoCSharpChangesToApply);
             App.Process.ClearOutput();