[StaticWebAssets] Fix recursive glob stem truncation for multi‑dot component JS module files and expand pattern coverage (#50863)

Author: javiercn

src/StaticWebAssetsSdk/Tasks/Utils/Globbing/StaticWebAssetGlobMatcher.cs

@@ -479,7 +479,10 @@ private static MatchStage GetInitialStage(GlobNode node)
             return MatchStage.Done;
         }
 
-        internal readonly MatchState NextExtension(int extensionIndex) => new(Node, MatchStage.Extension, SegmentIndex, extensionIndex, ComplexSegmentIndex);
+        internal readonly MatchState NextExtension(int extensionIndex) => new(Node, MatchStage.Extension, SegmentIndex, extensionIndex, ComplexSegmentIndex)
+        {
+            StemStartIndex = StemStartIndex
+        };
 
         internal readonly MatchState NextComplex() => new(Node, MatchStage.Complex, SegmentIndex, ExtensionSegmentIndex, ComplexSegmentIndex + 1);
 

test/Microsoft.NET.Sdk.StaticWebAssets.Tests/StaticWebAssets/Globbing/StaticWebAssetGlobMatcherTest.cs

@@ -27,6 +27,29 @@ namespace Microsoft.AspNetCore.StaticWebAssets.Tasks.Test;
 // Recursive wildcard in the middle 'a/**/c'
 public partial class StaticWebAssetGlobMatcherTest
 {
+        [Theory]
+        [InlineData("**/*.razor.js", "Components/Pages/RegularComponent.razor.js", "Components/Pages/RegularComponent.razor.js")]
+        [InlineData("**/*.razor.js", "Components/User.Profile.Details.razor.js", "Components/User.Profile.Details.razor.js")]
+        [InlineData("**/*.razor.js", "Components/Area/Sub/Feature/User.Profile.Details.razor.js", "Components/Area/Sub/Feature/User.Profile.Details.razor.js")]
+        [InlineData("**/*.razor.js", "Components/Area/Sub/Feature/Deep.Component.Name.With.Many.Parts.razor.js", "Components/Area/Sub/Feature/Deep.Component.Name.With.Many.Parts.razor.js")]
+        [InlineData("**/*.cshtml.js", "Pages/Shared/_Host.cshtml.js", "Pages/Shared/_Host.cshtml.js")]
+        [InlineData("**/*.cshtml.js", "Areas/Admin/Pages/Dashboard.cshtml.js", "Areas/Admin/Pages/Dashboard.cshtml.js")]
+        [InlineData("*.lib.module.js", "Widget.lib.module.js", "Widget.lib.module.js")]
+        [InlineData("*.razor.css", "Component.razor.css", "Component.razor.css")]
+        [InlineData("*.cshtml.css", "View.cshtml.css", "View.cshtml.css")]
+        [InlineData("*.modules.json", "app.modules.json", "app.modules.json")]
+        [InlineData("*.lib.module.js", "Rcl.Client.Feature.lib.module.js", "Rcl.Client.Feature.lib.module.js")]
+        public void Can_Match_WellKnownExistingPatterns(string pattern, string path, string expectedStem)
+        {
+            var matcher = new StaticWebAssetGlobMatcherBuilder();
+            matcher.AddIncludePatterns(pattern);
+            var globMatcher = matcher.Build();
+
+            var match = globMatcher.Match(path);
+            Assert.True(match.IsMatch);
+            Assert.Equal(pattern, match.Pattern);
+            Assert.Equal(expectedStem, match.Stem);
+        }
     [Fact]
     public void CanMatchLiterals()
     {