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
*            the column number
	 * @since 3.1
	 */
	public void editElement(Object element, int column) {
		treeViewerImpl.editElement(element, column);
	}
	
    /**
	 * Returns the cell editors of this tree viewer.
	 * 
	 * @return the list of cell editors
	 * @since 3.1
	 */
	public CellEditor[] getCellEditors() {
		return treeViewerImpl.getCellEditors();
	}
	/**
	 * Returns the cell modifier of this tree viewer.
	 * 
	 * @return the cell modifier
	 * @since 3.1
	 */
	public ICellModifier getCellModifier() {
		return treeViewerImpl.getCellModifier();
	}
	
    /* (non-Javadoc)
     * Method declared in AbstractTreeViewer.
     */
    protected Item[] getChildren(Widget o) {