Bug 312959 [Import/Export] importing file from big disk hangs UI
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/wizards/datatransfer/WizardFileSystemResourceImportPage1.java
/**
     * Creates and returns a <code>FileSystemElement</code> if the specified
     * file system object merits one.  The criteria for this are:
     * Also create the children.
     */
    protected MinimizedFileSystemElement createRootElement(
            Object fileSystemObject, IImportStructureProvider provider) {
        boolean isContainer = provider.isFolder(fileSystemObject);
        String elementLabel = provider.getLabel(fileSystemObject);
        
        
        MinimizedFileSystemElement dummyParent = new MinimizedFileSystemElement(
                "", null, true);
        dummyParent.setPopulated();
        MinimizedFileSystemElement result = new MinimizedFileSystemElement(
                elementLabel, dummyParent, isContainer);
        result.setFileSystemObject(fileSystemObject);
        
        result.getFiles(provider);
        return dummyParent;
    }
    /**
     *	Create the import source specification widgets
     */
    protected void createSourceGroup(Composite parent) {
        createRootDirectoryGroup(parent);
        createFileSelectionGroup(parent);
        createButtonsGroup(parent);
    }
    /**