refine code more

Author: zhuxingwei

Runtime/gestures/hover.cs

@@ -1,6 +1,4 @@
-using System;
 using Unity.UIWidgets.foundation;
-using UnityEngine;
 
 namespace Unity.UIWidgets.gestures {
 
@@ -18,5 +16,11 @@ public HoverRecognizer(object debugOwner = null) {
         public PointerHoverEnterCallback OnPointerEnter;
 
         public PointerHoverLeaveCallback OnPointerLeave;
+        
+        public override void debugFillProperties(DiagnosticPropertiesBuilder properties) {
+            base.debugFillProperties(properties);
+            properties.add(new DiagnosticsProperty<object>("debugOwner", this.debugOwner,
+                defaultValue: Diagnostics.kNullDefaultValue));
+        }
     }
 }

Runtime/painting/text_span.cs

@@ -170,7 +170,7 @@ public RenderComparison compareTo(TextSpan other) {
                 ? RenderComparison.identical
                 : RenderComparison.metadata;
 
-            if (!Equals(this.recognizer, other.recognizer)) {
+            if (!Equals(this.hoverRecognizer, other.hoverRecognizer)) {
                 result = RenderComparison.function > result ? RenderComparison.function : result;
             }