Add fact attributes to tests

src/EditorFeatures/Core/Implementation/IntelliSense/Completion/Controller_TypeChar.cs

@@ -368,6 +368,11 @@ private bool IsFilterCharacter(char ch, Model model)
                 return false;
             }
 
+            if (model.SelectedItemOpt == null)
+            {
+                return false;
+            }
+
             if (model.SelectedItemOpt == model.SuggestionModeItem)
             {
                 return char.IsLetterOrDigit(ch);

src/EditorFeatures/Test2/IntelliSense/CSharpCompletionCommandHandlerTests.vb

@@ -2833,7 +2833,7 @@ class C
             End Using
         End Function
 
-        ' <WpfFact, Trait(Traits.Feature, Traits.Features.Completion)>
+        <WpfFact, Trait(Traits.Feature, Traits.Features.Completion)>
         Public Async Function Filters_EmptyList4() As Task
             Using state = TestState.CreateCSharpTestState(
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