Made some minor changes so that the hint is associated with the prior character

src/EditorFeatures/Core.Wpf/InlineParameterNameHints/InlineParameterNameHintsTag.cs

@@ -21,11 +21,11 @@ internal class InlineParameterNameHintsTag : IntraTextAdornmentTag
 
         /// <summary>
         /// Creates the UIElement on call
-        /// Uses PositionAffinity.Successor because we want the tag to be associated with the following character
+        /// Uses PositionAffinity.Predecessor because we want the tag to be associated with the preceding character
         /// </summary>
         /// <param name="text">The name of the parameter associated with the argument</param>
         public InlineParameterNameHintsTag(string text, double lineHeight, TextFormattingRunProperties format)
-            : base(CreateElement(text, lineHeight, format), removalCallback: null, PositionAffinity.Successor)
+            : base(CreateElement(text, lineHeight, format), removalCallback: null, PositionAffinity.Predecessor)
         {
         }
 

src/EditorFeatures/Core/InlineParameterNameHints/InlineParameterNameHintsDataTaggerProvider.cs

@@ -38,6 +38,7 @@ internal class InlineParameterNameHintsDataTaggerProvider : AsynchronousViewTagg
         private readonly IAsynchronousOperationListener _listener;
 
         protected override IEnumerable<PerLanguageOption2<bool>> PerLanguageOptions => SpecializedCollections.SingletonEnumerable(FeatureOnOffOptions.InlineParameterNameHints);
+        protected override SpanTrackingMode SpanTrackingMode => SpanTrackingMode.EdgeInclusive;
 
         [Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
         [ImportingConstructor]