Bug 156883 [Viewers] enhancements to ILazyTreeContentProvider
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTreeViewer.java
* This method should be called (by the content provider) when elements have
	 * been removed from the model, in order to cause the viewer to accurately
	 * reflect the model. This method only affects the viewer, not the model.
	 * </p>
	 * 
	 * @param elementsOrTreePaths
	 *            the elements to remove
	 */
	public void remove(final Object[] elementsOrTreePaths) {
		assertElementsNotNull(elementsOrTreePaths);
		if (elementsOrTreePaths.length == 0) {
			return;
		}
		preservingSelection(new Runnable() {
			public void run() {
				internalRemove(elementsOrTreePaths);
			}
		});
	}
	/**
	 * Removes the given elements from this viewer whenever they appear as
	 * children of the given parent element. If the given elements also appear
	 * as children of some other parent, the other parent will remain unchanged.
	 * The selection is updated if required.
	 * <p>
	 * This method should be called (by the content provider) when elements have
	 * been removed from the model, in order to cause the viewer to accurately
	 * reflect the model. This method only affects the viewer, not the model.
	 * </p>
	 *