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diff --git a/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Document/ILineTracker.cs b/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Document/ILineTracker.cs
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+++ b/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Document/ILineTracker.cs
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+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
+
+using System;
+
+namespace Tango.Scripting.Editors.Document
+{
+	/// <summary>
+	/// Allows for low-level line tracking.
+	/// </summary>
+	/// <remarks>
+	/// The methods on this interface are called by the TextDocument's LineManager immediately after the document
+	/// has changed, *while* the DocumentLineTree is updating.
+	/// Thus, the DocumentLineTree may be in an invalid state when these methods are called.
+	/// This interface should only be used to update per-line data structures like the HeightTree.
+	/// Line trackers must not cause any events to be raised during an update to prevent other code from seeing
+	/// the invalid state.
+	/// Line trackers may be called while the TextDocument has taken a lock.
+	/// You must be careful not to dead-lock inside ILineTracker callbacks.
+	/// </remarks>
+	public interface ILineTracker
+	{
+		/// <summary>
+		/// Is called immediately before a document line is removed.
+		/// </summary>
+		void BeforeRemoveLine(DocumentLine line);
+		
+//		/// <summary>
+//		/// Is called immediately after a document line is removed.
+//		/// </summary>
+//		void AfterRemoveLine(DocumentLine line);
+		
+		/// <summary>
+		/// Is called immediately before a document line changes length.
+		/// This method will be called whenever the line is changed, even when the length stays as it is.
+		/// The method might be called multiple times for a single line because
+		/// a replacement is internally handled as removal followed by insertion.
+		/// </summary>
+		void SetLineLength(DocumentLine line, int newTotalLength);
+		
+		/// <summary>
+		/// Is called immediately after a line was inserted.
+		/// </summary>
+		/// <param name="newLine">The new line</param>
+		/// <param name="insertionPos">The existing line before the new line</param>
+		void LineInserted(DocumentLine insertionPos, DocumentLine newLine);
+		
+		/// <summary>
+		/// Indicates that there were changes to the document that the line tracker was not notified of.
+		/// The document is in a consistent state (but the line trackers aren't), and line trackers should
+		/// throw away their data and rebuild the document.
+		/// </summary>
+		void RebuildDocument();
+	}
+}