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
public boolean getExpandedState(Object element) {
        Assert.isNotNull(element);
        Widget item = findItem(element);
        if (item instanceof Item)
            return getExpanded((Item) item);
        return false;
    }
    /**
     * Returns the number of child items of the given SWT control.
     * 
     * @param control
     *           the control
     * @return the number of children
     */
    protected abstract int getItemCount(Control control);
    /**
     * Returns the number of child items of the given SWT item.
     * 
     * @param item
     *           the item
     * @return the number of children
     */
    protected abstract int getItemCount(Item item);
    /**
     * Returns the child items of the given SWT item.
     * 
     * @param item
     *           the item
     * @return the child items
     */