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
* </p>
     * 
     * @param widget
     *           the widget
     */
    protected void createChildren(final Widget widget) {
        final Item[] tis = getChildren(widget);
        if (tis != null && tis.length > 0) {
            Object data = tis[0].getData();
            if (data != null)
                return; 
        }
        BusyIndicator.showWhile(widget.getDisplay(), new Runnable() {
            public void run() {
                
                
                if (tis != null) {
                    for (int i = 0; i < tis.length; i++) {
                        if (tis[i].getData() != null) {
                            disassociate(tis[i]);
                            Assert.isTrue(tis[i].getData() == null,
                                    "Second or later child is non -null");
                        }
                        tis[i].dispose();
                    }
                }
                Object d = widget.getData();
                if (d != null) {
                    Object parentElement = d;
                    Object[] children = getSortedChildren(parentElement);