hook_menu_alter() overrides default page callback for other themes

The following patch fixes an issue where the default page callback is overridden for other themes by jQuery Mobile when it should only be overridden if the current active theme is a sub-theme of Mobile jQuery or the theme itself.

jquerymobile/jquerymobile.module :: line 68

function jquerymobile_menu_alter(&$items) {
  $items['node']['page callback'] = 'jquerymobile_page_default';
}