Bug 100565 [Viewers] Tree viewer selection not revealed if unchanged
[RC3] Steps: 1. Check out org.eclipse.ui.workbench 2. Open Workbench.java 3. Ctrl-O to open Quick Outline 4. Type "r", note that the field "runEventLoop" is the first match 5. Type "u", note that the field is not shown anymore 6. Type arrow-down key, note that you cannot see the selected entry
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTreeViewer.java
if (siblings != null){
        	if(siblings.length <= 1) 
        		return getNextItem(parent, false);
        	
        	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) {