Remove ArgumentName.

src/EditorFeatures/Core/Extensibility/Completion/CompletionHelper.cs

@@ -298,11 +298,6 @@ protected int CompareMatches(PatternMatch match1, PatternMatch match2, Completio
             return 0;
         }
 
-        protected bool IsArgumentName(CompletionItem item)
-        {
-            return item.Tags.Contains(CompletionTags.ArgumentName);
-        }
-
         private static bool TextTypedSoFarMatchesItem(CompletionItem item, char ch, string textTypedSoFar)
         {
             var textTypedWithChar = textTypedSoFar + ch;

src/Features/Core/Portable/Completion/CommonCompletionItem.cs

@@ -24,7 +24,6 @@ internal static class CommonCompletionItem
             bool preselect = false,
             bool showsWarningIcon = false,
             bool shouldFormatOnCommit = false,
-            bool isArgumentName = false,
             ImmutableDictionary<string, string> properties = null,
             ImmutableArray<string> tags = default(ImmutableArray<string>),
             CompletionItemRules rules = null)
@@ -42,11 +41,6 @@ internal static class CommonCompletionItem
                 tags = tags.Add(CompletionTags.Warning);
             }
 
-            if (isArgumentName)
-            {
-                tags = tags.Add(CompletionTags.ArgumentName);
-            }
-
             properties = properties ?? ImmutableDictionary<string, string>.Empty;
             if (!description.IsDefault && description.Length > 0)
             {

src/Features/Core/Portable/Completion/CompletionTags.cs

@@ -24,7 +24,6 @@ public static class CompletionTags
         public const string Assembly = nameof(Assembly);
 
         // language elements
-        public const string ArgumentName = nameof(ArgumentName);
         public const string Class = nameof(Class);
         public const string Constant = nameof(Constant);
         public const string Delegate = nameof(Delegate);

src/Features/Core/Portable/Completion/Providers/SymbolCompletionItem.cs

@@ -59,7 +59,6 @@ internal static class SymbolCompletionItem
                 sortText: sortText ?? symbols[0].Name,
                 glyph: glyph ?? symbols[0].GetGlyph(),
                 preselect: preselect,
-                isArgumentName: isArgumentName,
                 showsWarningIcon: supportedPlatforms != null,
                 properties: props,
                 tags: tags,

src/Features/Core/Portable/PublicAPI.Unshipped.txt

@@ -112,7 +112,6 @@ Microsoft.CodeAnalysis.TextTags
 abstract Microsoft.CodeAnalysis.Completion.CompletionProvider.ProvideCompletionsAsync(Microsoft.CodeAnalysis.Completion.CompletionContext context) -> System.Threading.Tasks.Task
 abstract Microsoft.CodeAnalysis.Completion.CompletionService.GetCompletionsAsync(Microsoft.CodeAnalysis.Document document, int caretPosition, Microsoft.CodeAnalysis.Completion.CompletionTrigger trigger = default(Microsoft.CodeAnalysis.Completion.CompletionTrigger), System.Collections.Immutable.ImmutableHashSet<string> roles = null, Microsoft.CodeAnalysis.Options.OptionSet options = null, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) -> System.Threading.Tasks.Task<Microsoft.CodeAnalysis.Completion.CompletionList>
 abstract Microsoft.CodeAnalysis.Completion.CompletionService.Language.get -> string
-const Microsoft.CodeAnalysis.Completion.CompletionTags.ArgumentName = "ArgumentName" -> string
 const Microsoft.CodeAnalysis.Completion.CompletionTags.Assembly = "Assembly" -> string
 const Microsoft.CodeAnalysis.Completion.CompletionTags.Class = "Class" -> string
 const Microsoft.CodeAnalysis.Completion.CompletionTags.Constant = "Constant" -> string