Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Workflow.Activities/Designers/TaskDesigner.cs

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+namespace System.Workflow.Activities
+{
+    using System;
+    using System.Collections;
+    using System.Collections.Generic;
+    using System.Collections.Specialized;
+    using System.CodeDom;
+    using System.Collections.ObjectModel;
+    using System.ComponentModel;
+    using System.ComponentModel.Design;
+    using System.Drawing;
+    using System.Diagnostics;
+    using System.Runtime.Serialization;
+    using System.Drawing.Design;
+    using System.Drawing.Drawing2D;
+    using System.Windows.Forms;
+    using System.Workflow.ComponentModel;
+    using System.Workflow.ComponentModel.Design;
+    using System.Windows.Forms.Design;
+
+    #region Class ReplicatorDesigner
+
+    internal sealed class ReplicatorDesigner : System.Workflow.Activities.SequenceDesigner
+    {
+        public override bool CanInsertActivities(HitTestInfo insertLocation, ReadOnlyCollection<Activity> activitiesToInsert)
+        {
+            CompositeActivity compositeActivity = Activity as CompositeActivity;
+            if (compositeActivity != null && compositeActivity.EnabledActivities.Count > 0)
+                return false;
+
+            if (activitiesToInsert.Count > 1)
+                return false;
+
+            return base.CanInsertActivities(insertLocation, activitiesToInsert);
+        }
+    }
+
+    #endregion
+}