TagHelper QuickInfo (dotnet/aspnetcore-tooling#1443)

Add Hover support for TagHelpers and Components\n\nCommit migrated from c7815ea4f2

src/Razor/Microsoft.AspNetCore.Mvc.Razor.Extensions.Version1_X/test/LegacySectionTargetExtensionTest.cs

@@ -40,7 +40,7 @@ namespace Microsoft.AspNetCore.Razor.Language.Extensions
 ";
 
             var output = context.CodeWriter.GenerateCode();
-            Assert.Equal(expected, output);
+            Assert.Equal(expected, output, ignoreLineEndingDifferences: true);
         }
     }
 }

src/Razor/Microsoft.AspNetCore.Razor.Tools/test/DefaultExtensionAssemblyLoaderTest.cs

@@ -121,7 +121,7 @@ Delta: Gamma: Beta: Test B
 
                 var actual = builder.ToString();
 
-                Assert.Equal(expected, actual);
+                Assert.Equal(expected, actual, ignoreLineEndingDifferences: true);
             }
         }
     }

src/Razor/test/testassets/SimpleMvc22/TagHelpers/EnvironementTagHelper.cs

@@ -0,0 +1,17 @@
+using Microsoft.AspNetCore.Razor.TagHelpers;
+
+// Used for testing purposes to verify multiple TagHelpers applying to a single element.
+namespace SimpleMvc22.TagHelpers
+{
+    /// <summary>
+    /// I made it!
+    /// </summary>
+    [HtmlTargetElement("environment")]
+    public class EnvironmentTagHelper : TagHelper
+    {
+        /// <summary>
+        /// Exclude it!
+        /// </summary>
+        public string Exclude {get; set;}
+    }
+}