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
* @return <code>true</code> if the item is considered expanded and
     *         <code>false</code> if collapsed
     */
    protected abstract boolean getExpanded(Item item);
    /**
     * Returns a list of elements corresponding to expanded nodes in this
     * viewer's tree, including currently hidden ones that are marked as
     * expanded but are under a collapsed ancestor.
     * <p>
     * This method is typically used when preserving the interesting state of a
     * viewer; <code>setExpandedElements</code> is used during the restore.
     * </p>
     * 
     * @return the array of expanded elements
     * @see #setExpandedElements
     */
    public Object[] getExpandedElements() {
        ArrayList v = new ArrayList();
        internalCollectExpanded(v, getControl());
        return v.toArray();
    }
    /**
     * Returns whether the node corresponding to the given element is expanded
     * or collapsed.
     * 
     * @param element
     *           the element
     * @return <code>true</code> if the node is expanded, and <code>false</code>
     *         if collapsed
     */