Index: src/org/eclipse/draw2d/parts/Thumbnail.java
===================================================================
RCS file: /cvsroot/tools/org.eclipse.gef/plugins/org.eclipse.draw2d/src/org/eclipse/draw2d/parts/Thumbnail.java,v
retrieving revision 1.31
diff -u -r1.31 Thumbnail.java
--- src/org/eclipse/draw2d/parts/Thumbnail.java	18 Apr 2006 18:08:55 -0000	1.31
+++ src/org/eclipse/draw2d/parts/Thumbnail.java	27 Jan 2009 21:36:58 -0000
@@ -26,6 +26,7 @@
 import org.eclipse.draw2d.ScaledGraphics;
 import org.eclipse.draw2d.UpdateListener;
 import org.eclipse.draw2d.geometry.Dimension;
+import org.eclipse.draw2d.geometry.Point;
 import org.eclipse.draw2d.geometry.Rectangle;
 
 /**
@@ -39,7 +40,11 @@
 	extends Figure 
 	implements UpdateListener
 {
-
+	/**
+	 * keeps track of the location of the source Rectangle. It is used so that
+	 * the Thumbnail is only redrawn on an actual change not on a scroll
+	 */
+	private Point oldSourceRectLoc = null;
 /**
  * This updates the Thumbnail by breaking the thumbnail {@link Image} into
  * several tiles and updating each tile individually.  
@@ -229,7 +234,12 @@
 				sourceFigure.isMirrored() ? SWT.RIGHT_TO_LEFT : SWT.NONE);
 		thumbnailGraphics = new ScaledGraphics(new SWTGraphics(thumbnailGC));
 		thumbnailGraphics.scale(getScaleX());
-		thumbnailGraphics.translate(getSourceRectangle().getLocation().negate());
+		
+		/**
+		 * this value is used to check whether the figure has been scrolled 
+		 */
+		oldSourceRectLoc = getSourceRectangle().getLocation();
+		thumbnailGraphics.translate(oldSourceRectLoc.negate());
 		
 		Color color = sourceFigure.getForegroundColor();
 		if (color != null)
@@ -433,18 +443,29 @@
  * @see org.eclipse.draw2d.UpdateListener#notifyPainting(Rectangle, Map)
  */
 public void notifyPainting(Rectangle damage, Map dirtyRegions) {
-	Iterator dirtyFigures = dirtyRegions.keySet().iterator();
-	while (dirtyFigures.hasNext()) {
-		IFigure current = (IFigure)dirtyFigures.next();
-		while (current != null) {
-			if (current == getSource()) {
-				setDirty(true);
-				repaint();
-				return;
+	/**
+	 * The method first checks to see whether the Figure is being moved.
+	 * If it is, it updates the stored location of the Figure. If notifyPainting
+	 * has been called for a reason other than a scroll movement, it repaints
+	 */
+	Point sourceRectLoc = getSourceRectangle().getLocation();
+	if (oldSourceRectLoc==null||oldSourceRectLoc.equals(sourceRectLoc))
+	{					
+		Iterator dirtyFigures = dirtyRegions.keySet().iterator();
+		while (dirtyFigures.hasNext()) {
+			IFigure current = (IFigure)dirtyFigures.next();
+			while (current != null) {
+				if (current == getSource()) {
+					setDirty(true);
+					repaint();
+					return;
+				}
+				current = current.getParent();
 			}
-			current = current.getParent();
 		}
 	}
+	else
+		oldSourceRectLoc = sourceRectLoc;
 }
 
 /**