Bug 172019 [Viewers] Plus sign doesn't disappear when using deferred content providers
3.3 M4 Use a tree viewer with a content provider using IDeferredWorkbenchAdapter and DeferredTreeContentManager. When fetchDeferredChildren is call and no elements are reported to the element collector the plus sign of the node doesn't disappear. This work without problems under Windows and Mac/OS (e.g. the plus sign disappears).
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTreeViewer.java
}
			for (int i = 0; i < siblings.length; i++) {
				if (siblings[i] == item && i < (siblings.length - 1)) {
					return siblings[i + 1];
				}
			}
		}
		return getNextItem(parent, false);
	}
	/**
	 * Returns the parent item of the given item in the tree, or
	 * <code>null</code> if there is no parent item.
	 * 
	 * @param item
	 *            the item
	 * @return the parent item, or <code>null</code> if none
	 */
	protected abstract Item getParentItem(Item item);
	/**
	 * Returns the item before the given item in the tree, or <code>null</code>
	 * if there is no previous item.
	 * 
	 * @param item
	 *            the item
	 * @return the previous item, or <code>null</code> if none
	 */
	protected Item getPreviousItem(Item item) {
		
		
		Item parent = getParentItem(item);