Bug 312959 [Import/Export] importing file from big disk hangs UI
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/dialogs/ResourceTreeAndListGroup.java
grayUpdateHierarchy(parent);
    }
    /**
     * Set the initial checked state of the passed element to true,
     * as well as to all of its children and associated list elements
     * @param element
     */
    public void initialCheckTreeItem(Object element) {
        treeItemChecked(element, true);
        selectAndReveal(element);
    }
    private void selectAndReveal(Object treeElement) {
        treeViewer.reveal(treeElement);
        IStructuredSelection selection = new StructuredSelection(treeElement);
        treeViewer.setSelection(selection);
    }
    /**
     *	Initialize this group's viewers after they have been laid out.
     */
    protected void initialize() {
        treeViewer.setInput(root);
        this.expandedTreeNodes = new ArrayList();
        this.expandedTreeNodes.add(root);
    }
    /**
     *	Callback that's invoked when the checked status of an item in the list
     *	is changed by the user. Do not try and update the hierarchy if we are building the
     *  initial list.
     */
    protected void listItemChecked(Object listElement, boolean state,