Merge pull request #12089 from tvand7093/issue-8322

Fixed broken partial tags in Xml documentation 

src/EditorFeatures/CSharpTest/Completion/CompletionProviders/XmlDocumentationCommentCompletionProviderTests.cs

@@ -1083,5 +1083,31 @@ static void Main(string[] args)
 }
 ", "args");
         }
-    }
+
+        [WorkItem(8322, "https://github.com/dotnet/roslyn/issues/8322")]
+        [Fact, Trait(Traits.Feature, Traits.Features.Completion)]
+        public async Task PartialTagCompletion()
+        {
+            await VerifyItemsExistAsync(@"
+public class foo
+{
+    /// <r$$
+    public void bar() { }
+}", "!--", "![CDATA[", "completionlist", "example", "exception", "include", "permission", "remarks", "see", "seealso", "summary");
+        }
+
+		[WorkItem(8322, "https://github.com/dotnet/roslyn/issues/8322")]
+		[Fact, Trait(Traits.Feature, Traits.Features.Completion)]
+		public async Task PartialTagCompletionNestedTags()
+		{
+			await VerifyItemsExistAsync(@"
+public class foo
+{
+    /// <summary>
+	/// <r$$
+	/// </summary>
+    public void bar() { }
+}", "!--", "![CDATA[", "c", "code", "list", "para", "see", "seealso");
+		}
+	}
 }

src/Features/CSharp/Portable/Completion/CompletionProviders/XmlDocCommentCompletionProvider.cs

@@ -17,7 +17,7 @@
 
 namespace Microsoft.CodeAnalysis.CSharp.Completion.Providers
 {
-    internal partial class XmlDocCommentCompletionProvider : AbstractDocCommentCompletionProvider
+	internal partial class XmlDocCommentCompletionProvider : AbstractDocCommentCompletionProvider
     {
         internal override bool IsInsertionTrigger(SourceText text, int characterPosition, OptionSet options)
         {
@@ -73,7 +73,8 @@ internal override bool IsInsertionTrigger(SourceText text, int characterPosition
                 (token.Parent.IsKind(SyntaxKind.XmlName) && token.Parent.IsParentKind(SyntaxKind.XmlEmptyElement)))
             {
                 // The user is typing inside an XmlElement
-                if (token.Parent.Parent.Kind() == SyntaxKind.XmlElement)
+                if (token.Parent.Parent.Kind() == SyntaxKind.XmlElement ||
+                    token.Parent.Parent.IsParentKind(SyntaxKind.XmlElement))
                 {
                     items.AddRange(GetNestedTags(declaredSymbol));
                 }
@@ -83,7 +84,7 @@ internal override bool IsInsertionTrigger(SourceText text, int characterPosition
                     items.AddRange(GetListItems(span));
                 }
 
-                if (token.Parent.IsParentKind(SyntaxKind.XmlEmptyElement) & token.Parent.Parent.IsParentKind(SyntaxKind.XmlElement))
+                if (token.Parent.IsParentKind(SyntaxKind.XmlEmptyElement) && token.Parent.Parent.IsParentKind(SyntaxKind.XmlElement))
                 {
                     var element = (XmlElementSyntax)token.Parent.Parent.Parent;
                     if (element.StartTag.Name.LocalName.ValueText == ListTagName)
@@ -97,7 +98,8 @@ internal override bool IsInsertionTrigger(SourceText text, int characterPosition
                     items.AddRange(GetListHeaderItems());
                 }
 
-                if (token.Parent.Parent is DocumentationCommentTriviaSyntax)
+                if (token.Parent.Parent is DocumentationCommentTriviaSyntax ||
+                    (token.Parent.Parent.IsKind(SyntaxKind.XmlEmptyElement) && token.Parent.Parent.Parent is DocumentationCommentTriviaSyntax))
                 {
                     items.AddRange(GetTopLevelSingleUseNames(parentTrivia, span));
                     items.AddRange(GetTopLevelRepeatableItems());