Add code to track if a view has been rendered, fix issue with duplication of the view, I am not sure if this method of tracking that the view has been rendered is correct, but it works for now

Headers/AppKit/NSTableView.h

@@ -185,7 +185,10 @@ APPKIT_EXPORT_CLASS
   NSDragOperation _draggingSourceOperationMaskForRemote;
 
   NSInteger _beginEndUpdates;
+
+  /* Supporting ivars for view based tables */
   BOOL _viewBased;
+  NSMutableArray *_renderedViewPaths;
 }
 
 /* Data Source */

Source/GSThemeDrawing.m

@@ -78,6 +78,7 @@
 		      row: (NSInteger)index;
 - (id)_objectValueForTableColumn: (NSTableColumn *)tb
 			     row: (NSInteger)index;
+- (NSMutableArray *) _renderedViewPaths;
 @end
 
 @interface NSTableColumn (Private)
@@ -3539,7 +3540,17 @@ static NSDictionary *titleTextAttributes[3] = {nil, nil, nil};
 			     frameOfCellAtColumn: i
 					     row: rowIndex];
       NSTableColumn *tb = nil;
+      NSIndexPath *path = [NSIndexPath indexPathForItem: i
+					      inSection: rowIndex];
+      NSMutableArray *paths = [tableView _renderedViewPaths];
 
+      // If the path has been rendered, move on...
+      if ([paths containsObject: path])
+	continue;
+      
+      // Store the path...
+      [paths addObject: path];
+      
       // drawingRect.origin.y += headerHeight;
       tb = [tableColumns objectAtIndex: i];
       if (hasMethod)

Source/NSTableView.m

@@ -2044,7 +2044,9 @@ static void computeNewSelection
       | NSDragOperationLink | NSDragOperationGeneric | NSDragOperationPrivate;
   _draggingSourceOperationMaskForRemote = NSDragOperationNone;
   ASSIGN(_sortDescriptors, [NSArray array]);
+
   _viewBased = NO;
+  _renderedViewPaths = [[NSMutableArray alloc] init];
 }
 
 - (id) initWithFrame: (NSRect)frameRect
@@ -2076,6 +2078,7 @@ static void computeNewSelection
   RELEASE (_selectedColumns);
   RELEASE (_selectedRows);
   RELEASE (_sortDescriptors);
+  RELEASE (_renderedViewPaths);
   TEST_RELEASE (_headerView);
   TEST_RELEASE (_cornerView);
   if (_autosaveTableColumns == YES)
@@ -7087,4 +7090,9 @@ For a more detailed explanation, -setSortDescriptors:. */
     }
 }
 
+- (NSMutableArray *) _renderedViewPaths
+{
+  return _renderedViewPaths;
+}
+
 @end