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diff --git a/scintilla/src/ContractionState.h b/scintilla/src/ContractionState.h
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+// Scintilla source code edit control
+/** @file ContractionState.h
+ ** Manages visibility of lines for folding and wrapping.
+ **/
+// Copyright 1998-2007 by Neil Hodgson <neilh@scintilla.org>
+// The License.txt file describes the conditions under which this software may be distributed.
+
+#ifndef CONTRACTIONSTATE_H
+#define CONTRACTIONSTATE_H
+
+#ifdef SCI_NAMESPACE
+namespace Scintilla {
+#endif
+
+/**
+ */
+class ContractionState {
+	// These contain 1 element for every document line.
+	RunStyles *visible;
+	RunStyles *expanded;
+	RunStyles *heights;
+	Partitioning *displayLines;
+	int linesInDocument;
+
+	void EnsureData();
+
+	bool OneToOne() const {
+		// True when each document line is exactly one display line so need for
+		// complex data structures.
+		return visible == 0;
+	}
+
+public:
+	ContractionState();
+	virtual ~ContractionState();
+
+	void Clear();
+
+	int LinesInDoc() const;
+	int LinesDisplayed() const;
+	int DisplayFromDoc(int lineDoc) const;
+	int DocFromDisplay(int lineDisplay) const;
+
+	void InsertLine(int lineDoc);
+	void InsertLines(int lineDoc, int lineCount);
+	void DeleteLine(int lineDoc);
+	void DeleteLines(int lineDoc, int lineCount);
+
+	bool GetVisible(int lineDoc) const;
+	bool SetVisible(int lineDocStart, int lineDocEnd, bool visible);
+
+	bool GetExpanded(int lineDoc) const;
+	bool SetExpanded(int lineDoc, bool expanded);
+
+	int GetHeight(int lineDoc) const;
+	bool SetHeight(int lineDoc, int height);
+
+	void ShowAll();
+	void Check() const;
+};
+
+#ifdef SCI_NAMESPACE
+}
+#endif
+
+#endif