Add fullcalendar print stylesheet

fullcalendar_library.libraries.yml

@@ -8,7 +8,8 @@ fullcalendar:
     - core/jquery
   css:
     theme:
-      /libraries/fullcalendar/fullcalendar.min.css: { minified: true }
+      /libraries/fullcalendar/fullcalendar.min.css: { media: screen, minified: true }
+      /libraries/fullcalendar/fullcalendar.print.min.css: { media: print, minified: true }
 
 fullcalendar-scheduler:
   version: VERSION

fullcalendar_library.module

@@ -3,6 +3,7 @@
 define('FULLCALENDAR_JS_CDN', 'https://cdn.jsdelivr.net/npm/fullcalendar@3.8.0/dist/fullcalendar.min.js');
 define('FULLCALENDAR_LOCALE_JS_CDN', 'https://cdn.jsdelivr.net/npm/fullcalendar@3.8.0/dist/locale-all.js');
 define('FULLCALENDAR_CSS_CDN', 'https://cdn.jsdelivr.net/npm/fullcalendar@3.8.0/dist/fullcalendar.min.css');
+define('FULLCALENDAR_PRINT_CSS_CDN', 'https://cdn.jsdelivr.net/npm/fullcalendar@3.8.0/dist/fullcalendar.print.min.css');
 define('FULLCALENDAR_SCHEDULER_JS_CDN', 'https://cdn.jsdelivr.net/npm/fullcalendar-scheduler@1.9.1/dist/scheduler.min.js');
 define('FULLCALENDAR_SCHEDULER_CSS_CDN', 'https://cdn.jsdelivr.net/npm/fullcalendar-scheduler@1.9.1/dist/scheduler.min.css');
 define('MOMENT_JS_CDN', 'https://cdn.jsdelivr.net/npm/moment@2.20.1/moment.min.js');
@@ -32,6 +33,11 @@ function fullcalendar_library_library_info_alter(&$libraries, $extension) {
       $libraries['fullcalendar']['css']['theme'][FULLCALENDAR_CSS_CDN] = ['type' => 'external', 'minified' => TRUE];
     }
 
+    if (!file_exists(DRUPAL_ROOT . '/libraries/fullcalendar/fullcalendar.print.min.css')) {
+      unset($libraries['fullcalendar']['css']['theme']['/libraries/fullcalendar/fullcalendar.print.min.css']);
+      $libraries['fullcalendar']['css']['theme'][FULLCALENDAR_PRINT_CSS_CDN] = ['type' => 'external', 'minified' => TRUE];
+    }
+
     if (!file_exists(DRUPAL_ROOT . '/libraries/fullcalendar-scheduler/scheduler.min.js')) {
       unset($libraries['fullcalendar-scheduler']['js']['/libraries/fullcalendar-scheduler/scheduler.min.js']);
       $libraries['fullcalendar-scheduler']['js'][FULLCALENDAR_SCHEDULER_JS_CDN] = ['type' => 'external', 'minified' => TRUE];