Fix potentially ambiguous System.Object in _Imports.razor (#10999)

* Add a test

* Fix potentially ambiguous System.Object in _Imports.razor

* Update baselines

Author: jjonescz

src/Compiler/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/ComponentImports/_Imports.codegen.cs

@@ -22,7 +22,7 @@ namespace Test
 #nullable disable
     [global::Microsoft.AspNetCore.Components.LayoutAttribute(typeof(MainLayout))]
     #nullable restore
-    public partial class _Imports : System.Object
+    public partial class _Imports : object
     #nullable disable
     {
         #pragma warning disable 219

src/Compiler/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/ComponentImports/_Imports.ir.txt

@@ -9,7 +9,7 @@
         UsingDirective - (21:1,1 [23] x:\dir\subdir\Test\_Imports.razor) - System.Reflection
         CSharpCode - 
             IntermediateToken -  - CSharp - [global::Microsoft.AspNetCore.Components.LayoutAttribute(typeof(MainLayout))]
-        ClassDeclaration -  - public partial - _Imports - System.Object - 
+        ClassDeclaration -  - public partial - _Imports - object - 
             DesignTimeDirective - 
                 DirectiveToken - (56:3,8 [10] x:\dir\subdir\Test\_Imports.razor) - MainLayout
             CSharpCode - 

src/Compiler/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/ComponentImports/_Imports.mappings.txt

@@ -10,11 +10,11 @@ Generated Location: (460:17,0 [23] )
 
 Source Location: (56:3,8 [10] x:\dir\subdir\Test\_Imports.razor)
 |MainLayout|
-Generated Location: (923:32,0 [10] )
+Generated Location: (916:32,0 [10] )
 |MainLayout|
 
 Source Location: (69:4,1 [3] x:\dir\subdir\Test\_Imports.razor)
 |Foo|
-Generated Location: (1356:49,6 [3] )
+Generated Location: (1349:49,6 [3] )
 |Foo|
 

src/Compiler/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/ComponentImports/_Imports.codegen.cs

@@ -24,7 +24,7 @@ namespace Test
     ;
     [global::Microsoft.AspNetCore.Components.LayoutAttribute(typeof(MainLayout))]
     #nullable restore
-    public partial class _Imports : System.Object
+    public partial class _Imports : object
     #nullable disable
     {
         #pragma warning disable 1998

src/Compiler/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/ComponentImports/_Imports.ir.txt

@@ -9,7 +9,7 @@
         UsingDirective - (21:1,1 [23] x:\dir\subdir\Test\_Imports.razor) - System.Reflection
         CSharpCode - 
             IntermediateToken -  - CSharp - [global::Microsoft.AspNetCore.Components.LayoutAttribute(typeof(MainLayout))]
-        ClassDeclaration -  - public partial - _Imports - System.Object - 
+        ClassDeclaration -  - public partial - _Imports - object - 
             MethodDeclaration -  - protected - void - Execute
                 CSharpExpression - (69:4,1 [3] x:\dir\subdir\Test\_Imports.razor)
                     LazyIntermediateToken - (69:4,1 [3] x:\dir\subdir\Test\_Imports.razor) - CSharp - Foo

src/Compiler/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/ComponentImports/_Imports.mappings.txt

@@ -10,6 +10,6 @@ Generated Location: (488:18,0 [23] )
 
 Source Location: (69:4,1 [3] x:\dir\subdir\Test\_Imports.razor)
 |Foo|
-Generated Location: (952:35,0 [3] )
+Generated Location: (945:35,0 [3] )
 |Foo|
 

src/Compiler/Microsoft.CodeAnalysis.Razor.Compiler/src/Language/Components/ComponentDocumentClassifierPass.cs

@@ -99,7 +99,7 @@ protected override void OnDocumentStructureCreated(
         {
             // We don't want component imports to be considered as real component.
             // But we still want to generate code for it so we can get diagnostics.
-            @class.BaseType = IntermediateToken.CreateCSharpToken(typeof(object).FullName);
+            @class.BaseType = IntermediateToken.CreateCSharpToken("object");
 
             method.ReturnType = "void";
             method.MethodName = "Execute";

src/Compiler/test/Microsoft.NET.Sdk.Razor.SourceGenerators.Tests/RazorSourceGeneratorComponentTests.cs

@@ -76,6 +76,28 @@ @using System.Net.Http
         result.VerifyOutputsMatchBaseline();
     }
 
+    [Fact]
+    public async Task ImportsRazor_SystemInNamespace()
+    {
+        // Arrange
+        var project = CreateTestProject(new()
+        {
+            ["System/_Imports.razor"] = """
+                @using global::System.Net.Http
+                """,
+        });
+        var compilation = await project.GetCompilationAsync();
+        var driver = await GetDriverAsync(project);
+
+        // Act
+        var result = RunGenerator(compilation!, ref driver);
+
+        // Assert
+        result.Diagnostics.Verify();
+        Assert.Single(result.GeneratedSources);
+        result.VerifyOutputsMatchBaseline();
+    }
+
     [Fact, WorkItem("https://github.com/dotnet/razor/issues/8718")]
     public async Task PartialClass()
     {

src/Compiler/test/Microsoft.NET.Sdk.Razor.SourceGenerators.Tests/TestFiles/RazorSourceGeneratorComponentTests/ImportsRazor/Folder1__Imports_razor.g.cs

@@ -18,7 +18,7 @@ namespace MyApp.Folder1
 #nullable disable
     ;
     #nullable restore
-    public partial class _Imports : System.Object
+    public partial class _Imports : object
     #nullable disable
     {
         #pragma warning disable 1998

src/Compiler/test/Microsoft.NET.Sdk.Razor.SourceGenerators.Tests/TestFiles/RazorSourceGeneratorComponentTests/ImportsRazor_SystemInNamespace/System__Imports_razor.g.cs

@@ -0,0 +1,31 @@
+#pragma checksum "System/_Imports.razor" "{ff1816ec-aa5e-4d10-87f7-6f4963833460}" "53b28fda6534c79c7b9a4da6dcc903c4b51cfab9"
+// <auto-generated/>
+#pragma warning disable 1591
+namespace MyApp.System
+{
+    #line default
+    using global::System;
+    using global::System.Collections.Generic;
+    using global::System.Linq;
+    using global::System.Threading.Tasks;
+    using global::Microsoft.AspNetCore.Components;
+#nullable restore
+#line (1,2)-(1,31) "System/_Imports.razor"
+using global::System.Net.Http
+
+#line default
+#line hidden
+#nullable disable
+    ;
+    #nullable restore
+    public partial class _Imports : object
+    #nullable disable
+    {
+        #pragma warning disable 1998
+        protected void Execute()
+        {
+        }
+        #pragma warning restore 1998
+    }
+}
+#pragma warning restore 1591

src/Compiler/test/Microsoft.NET.Sdk.Razor.SourceGenerators.Tests/TestFiles/RazorSourceGeneratorComponentTests/ImportsRazor_WithMarkup/_Imports_razor.g.cs

@@ -18,7 +18,7 @@ namespace MyApp
 #nullable disable
     ;
     #nullable restore
-    public partial class _Imports : System.Object
+    public partial class _Imports : object
     #nullable disable
     {
         #pragma warning disable 1998