Bug 87089 [Viewers] LabelProvider.getImage is not invoked after the TreeViewer changes introduced on 24/01/2005
If you compare the versions 1.26 and 1.25 of the method doUpdateItem(Item item, Object element) in org.eclipse.jface.viewers.TreeViewer, you will notice a change in the way the image of the element is calculated. In 1.25, the image of the Element is set in the "buildLabel" method which doesn't have a special treatment for ITableLabelProvider. In 1.26, if the label provider is a ITableLabelProvider, instead of calling ILabelProvider.getImage(Object), the code always invokes ITableLabelProvider.getColunmImage(Object). This change has broken the icons on one of the EMF generated editors (the mapping editor) as the images I will attach here demostrate.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TreeViewer.java
if (treeItem.isDisposed()) {
		                unmapElement(element);
		                return;
		            }   
					
					text = updateLabel.getText();
					image = updateLabel.getImage();
				}
			} else {
				text = tprov.getColumnText(element, column);
				image = tprov.getColumnImage(element, column);
			}
			
			if (text == null)
				text = ""; 
			treeItem.setText(column, text);
			if (treeItem.getImage(column) != image) {
				treeItem.setImage(column, image);
			}
		}
		colorAndFontCollector.applyFontsAndColors(treeItem);
    }
    /**
	 * Starts editing the given element.
	 * 
	 * @param element
	 *            the element
	 * @param column