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diff --git a/src/Text/Def/TextUI/Editor/ITextView2.cs b/src/Text/Def/TextUI/Editor/ITextView2.cs
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+++ b/src/Text/Def/TextUI/Editor/ITextView2.cs
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+//
+//  Copyright (c) Microsoft Corporation. All rights reserved.
+//  Licensed under the MIT License. See License.txt in the project root for license information.
+//
+
+using System;
+
+namespace Microsoft.VisualStudio.Text.Editor
+{
+    /// <summary>
+    /// Extensions to <see cref="ITextView"/>, augmenting functionality. For every member here
+    /// there should also be an extension method in <see cref="TextViewExtensions"/>.
+    /// </summary>
+    public interface ITextView2 : ITextView
+    {
+        /// <summary>
+        /// Determines whether the view is in the process of being laid out or is preparing to be laid out.
+        /// </summary>
+        /// <remarks>
+        /// As opposed to <see cref="ITextView.InLayout"/>, it is safe to get the <see cref="ITextView.TextViewLines"/>
+        /// but attempting to queue another layout will cause a reentrant layout exception.
+        /// </remarks>
+        bool InOuterLayout
+        {
+            get;
+        }
+
+        /// <summary>
+        /// Gets an object for managing selections within the view.
+        /// </summary>
+        IMultiSelectionBroker MultiSelectionBroker
+        {
+            get;
+        }
+
+
+        /// <summary>
+        /// Raised whenever the view's MaxTextRightCoordinate is changed.
+        /// </summary>
+        /// <remarks>
+        /// This event will only be rasied if the MaxTextRightCoordinate is changed by changing the MinMaxTextRightCoordinate property
+        /// (it will not be raised as a side-effect of a layout even if the layout does change the MaxTextRightCoordinate).
+        /// </remarks>
+        event EventHandler MaxTextRightCoordinateChanged;
+    }
+}