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
}
    /**
     * Update the structure and recurse. Items are updated in updateChildren,
     * as needed.
     * @param widget
     * @param element
     * @param updateLabels
     */
    private void internalRefreshStruct(Widget widget, Object element,
            boolean updateLabels) {
        updateChildren(widget, element, null, updateLabels);
        Item[] children = getChildren(widget);
        if (children != null) {
            for (int i = 0; i < children.length; i++) {
                Widget item = children[i];
                Object data = item.getData();
                if (data != null)
                    internalRefreshStruct(item, data, updateLabels);
            }
        }
    }
    /**
     * Removes the given elements from this viewer.
     * <p>
     * EXPERIMENTAL.  Not to be used except by JDT.
     * This method was added to support JDT's explorations
     * into grouping by working sets, which requires viewers to support multiple 
     * equal elements.  See bug 76482 for more details.  This support will
     * likely be removed in Eclipse 3.2 in favour of proper support for
     * multiple equal elements.