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
}
    /**
     * Creates a tree viewer on the given tree control.
     * The viewer has no input, no content provider, a default label provider, 
     * no sorter, and no filters.
     *
     * @param tree the tree control
     */
    public TreeViewer(Tree tree) {
        super();
        this.tree = tree;
        hookControl(tree);
        treeEditor = new TreeEditor(tree);
		initTreeViewerImpl();
    }
    /* (non-Javadoc)
     * Method declared in AbstractTreeViewer.
     */
    protected void addTreeListener(Control c, TreeListener listener) {
        ((Tree) c).addTreeListener(listener);
    }
    /**
	 * Cancels a currently active cell editor. All changes already done in the
	 * cell editor are lost.
	 * @since 3.1
	 */
	public void cancelEditing() {
		treeViewerImpl.cancelEditing();
	}