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
* Returns whether the extension provided is an extension that
     * has been specified for export by the user.
     *
     * @param extension the resource name
     * @return <code>true</code> if the resource name is suitable for export based
     *   upon its extension
     */
    protected boolean isExportableExtension(String extension) {
        if (selectedTypes == null) {
			return true;
		}
        Iterator itr = selectedTypes.iterator();
        while (itr.hasNext()) {
            if (extension.equalsIgnoreCase((String) itr.next())) {
				return true;
			}
        }
        return false;
    }
    /**
     *	Repopulate the view based on the currently entered directory.
     */
    protected void resetSelection() {
        MinimizedFileSystemElement currentRoot = getFileSystemTree();
        this.selectionGroup.setRoot(currentRoot);
        File sourceDirectory = getSourceDirectory();
        if (sourceDirectory != null) {
			IPath path = getContainerFullPath();
	    	if (path != null && relativePathVariableGroup != null) {
				IResource target = ResourcesPlugin.getWorkspace().getRoot().findMember(path);