[dotnet] store the mutated element for the user not just the target id (#12948)

Author: titusfortner

dotnet/src/webdriver/DomMutationData.cs

@@ -70,6 +70,11 @@ public string AttributeOriginalValue
             internal set { this.attributeOriginalValue = value; }
         }
 
+        /// <summary>
+        /// Stores the element associated with the target ID
+        /// </summary>
+        public IWebElement Element { get; internal set; }
+
         /// <summary>
         /// Returns a string that represents the current object.
         /// </summary>

dotnet/src/webdriver/JavaScriptEngine.cs

@@ -20,6 +20,7 @@
 using System.Collections.Generic;
 using System.Globalization;
 using System.IO;
+using System.Linq;
 using System.Threading.Tasks;
 using Newtonsoft.Json;
 using OpenQA.Selenium.DevTools;
@@ -75,7 +76,7 @@ public JavaScriptEngine(IWebDriver driver)
         public event EventHandler<JavaScriptExceptionThrownEventArgs> JavaScriptExceptionThrown;
 
         /// <summary>
-        /// Occurs when methods on the JavaScript console are called. 
+        /// Occurs when methods on the JavaScript console are called.
         /// </summary>
         public event EventHandler<JavaScriptConsoleApiCalledEventArgs> JavaScriptConsoleApiCalled;
 
@@ -380,6 +381,9 @@ private void OnScriptBindingCalled(object sender, BindingCalledEventArgs e)
             if (e.Name == MonitorBindingName)
             {
                 DomMutationData valueChangeData = JsonConvert.DeserializeObject<DomMutationData>(e.Payload);
+                var locator = By.CssSelector($"*[data-__webdriver_id='{valueChangeData.TargetId}']");
+                valueChangeData.Element = driver.FindElements(locator).FirstOrDefault();
+
                 if (this.DomMutated != null)
                 {
                     this.DomMutated(this, new DomMutatedEventArgs()