1 files changed, 31 insertions, 0 deletions
diff --git a/src/Text/Def/Internal/TextLogic/ITextUndoHistory2.cs b/src/Text/Def/Internal/TextLogic/ITextUndoHistory2.cs
new file mode 100644
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+++ b/src/Text/Def/Internal/TextLogic/ITextUndoHistory2.cs
@@ -0,0 +1,31 @@
+//
+//  Copyright (c) Microsoft Corporation. All rights reserved.
+//  Licensed under the MIT License. See License.txt in the project root for license information.
+//
+using System;
+using System.Collections.Generic;
+using Microsoft.VisualStudio.Utilities;
+
+namespace Microsoft.VisualStudio.Text.Operations
+{
+    /// <summary>
+    /// Contains undo transactions.
+    /// </summary>
+    /// <remarks>
+    /// Typically only one undo transaction history at a time is availbble to the user.
+    /// </remarks>
+    public interface ITextUndoHistory2 : ITextUndoHistory
+    {
+        /// <summary>
+        /// Creates a new transaction, invisible, nests it in the previously current transaction, and marks it current.
+        /// </summary>
+        /// <param name="description">The description of the transaction.</param>
+        /// <returns>The new transaction.</returns>
+        /// <remarks>
+        /// <para>Invisible transactions are like normal undo transactions except that they are effectively invisible to the end user. They won't be displayed
+        /// in the undo stack and if the user does an "undo" then all the invisible transactions leading up to the 1st non-invisible transaction are "skipped".</para>
+        /// <para>Invisible transactions can only contain simple text edits (other types of undo actions will be lost and potentially corrupt the undo stack).</para>
+        /// </remarks>
+        ITextUndoTransaction CreateInvisibleTransaction(string description);
+    }
+}