Bug 167323 [Viewers]Open AbstractTreeViewer for external widget implementors
As reported by Ross Camara AbstractTreeViewer would work for nebula if we would open the API a bit. Boris and I decided that we will do this in 2 steps: 1. open the API 2. moving the Virtual-Support bits from TreeViewer to AbstractTreeViewer when the nebula grid provides virtual support.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTreeViewer.java
item.setImage(null);
						item.setText("");
					}
				}
			}
		}
		for (int i = 0; i < min; ++i) {
			Item item = items[i];
			Object newElement = elementChildren[i];
			if (item.getData() == null) {
				
				associate(newElement, item);
				updatePlus(item, newElement);
				updateItem(item, newElement);
			} else {
				
				updatePlus(item, newElement);
				if (updateLabels) {
					updateItem(item, newElement);
				}
			}
		}
		
		
		
		
		
		
		for (int i = 0; i < min; ++i) {