[dotnet] implement a way to reset Action builder sequences after perform is called

Author: titusfortner

dotnet/src/webdriver/Interactions/ActionBuilder.cs

@@ -66,6 +66,14 @@ public IList<ActionSequence> ToActionSequenceList()
             return new List<ActionSequence>(this.sequences.Values).AsReadOnly();
         }
 
+        /// <summary>
+        /// Resets the list of sequences.
+        /// </summary>
+        public void ClearSequences()
+        {
+            this.sequences = new Dictionary<InputDevice, ActionSequence>();
+        }
+
         /// <summary>
         /// Returns a string that represents the current <see cref="ActionBuilder"/>.
         /// </summary>

dotnet/src/webdriver/Interactions/Actions.cs

@@ -483,6 +483,7 @@ public IAction Build()
         public void Perform()
         {
             this.actionExecutor.PerformActions(this.actionBuilder.ToActionSequenceList());
+            this.actionBuilder.ClearSequences();
         }
 
         /// <summary>