Update to Drupal 8.2.0. For more information, see https://www.drupal.org/project/drupal/releases/8.2.0

core/misc/ajax.js

@@ -1203,18 +1203,21 @@
       var ajaxSettings = drupalSettings.ajax;
 
       // Clean up drupalSettings.ajax.
-      Drupal.ajax.expired().forEach(function (instance) {
-        // If the Ajax object has been created through drupalSettings.ajax
-        // it will have a selector. When there is no selector the object
-        // has been initialized with a special class name picked up by the
-        // Ajax behavior.
-        if (instance.selector) {
-          var selector = instance.selector.replace('#', '');
-          if (ajaxSettings && selector in ajaxSettings) {
-            delete ajaxSettings[selector];
+      if (ajaxSettings) {
+        Drupal.ajax.expired().forEach(function (instance) {
+          // If the Ajax object has been created through drupalSettings.ajax
+          // it will have a selector. When there is no selector the object
+          // has been initialized with a special class name picked up by the
+          // Ajax behavior.
+
+          if (instance.selector) {
+            var selector = instance.selector.replace('#', '');
+            if (selector in ajaxSettings) {
+              delete ajaxSettings[selector];
+            }
           }
-        }
-      });
+        });
+      }
 
       if (response.merge) {
         $.extend(true, drupalSettings, response.settings);

core/misc/icons/787878/plus.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16px" height="16px"><path fill="#787878" d="M0.656,9.023c0,0.274,0.224,0.5,0.499,0.5l4.853,0.001c0.274-0.001,0.501,0.226,0.5,0.5l0.001,4.853 c-0.001,0.273,0.227,0.5,0.501,0.5l1.995-0.009c0.273-0.003,0.497-0.229,0.5-0.503l0.002-4.806c0-0.272,0.228-0.5,0.499-0.502 l4.831-0.021c0.271-0.005,0.497-0.23,0.501-0.502l0.008-1.998c0-0.276-0.225-0.5-0.499-0.5l-4.852,0c-0.275,0-0.502-0.228-0.501-0.5 L9.493,1.184c0-0.275-0.225-0.499-0.5-0.499L6.997,0.693C6.722,0.694,6.496,0.92,6.495,1.195L6.476,6.026 c-0.001,0.274-0.227,0.5-0.501,0.5L1.167,6.525C0.892,6.526,0.665,6.752,0.665,7.026L0.656,9.023z"/></svg>

core/misc/icons/bebebe/plus.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="16px" height="16px"><path fill="#bebebe" d="M0.656,9.023c0,0.274,0.224,0.5,0.499,0.5l4.853,0.001c0.274-0.001,0.501,0.226,0.5,0.5l0.001,4.853 c-0.001,0.273,0.227,0.5,0.501,0.5l1.995-0.009c0.273-0.003,0.497-0.229,0.5-0.503l0.002-4.806c0-0.272,0.228-0.5,0.499-0.502 l4.831-0.021c0.271-0.005,0.497-0.23,0.501-0.502l0.008-1.998c0-0.276-0.225-0.5-0.499-0.5l-4.852,0c-0.275,0-0.502-0.228-0.501-0.5 L9.493,1.184c0-0.275-0.225-0.499-0.5-0.499L6.997,0.693C6.722,0.694,6.496,0.92,6.495,1.195L6.476,6.026 c-0.001,0.274-0.227,0.5-0.501,0.5L1.167,6.525C0.892,6.526,0.665,6.752,0.665,7.026L0.656,9.023z"/></svg>

core/misc/tabledrag.js

@@ -498,6 +498,9 @@
 
       var keyChange = false;
       var groupHeight;
+
+      /* eslint-disable no-fallthrough */
+
       switch (event.keyCode) {
         // Left arrow.
         case 37:
@@ -601,6 +604,8 @@
           break;
       }
 
+      /* eslint-enable no-fallthrough */
+
       if (self.rowObject && self.rowObject.changed === true) {
         $(item).addClass('drag');
         if (self.oldRowElement) {
@@ -624,6 +629,9 @@
     // other browsers need to return false on keypress.
     // http://www.quirksmode.org/js/keys.html
     handle.on('keypress', function (event) {
+
+      /* eslint-disable no-fallthrough */
+
       switch (event.keyCode) {
         // Left arrow.
         case 37:
@@ -635,6 +643,9 @@
         case 40:
           return false;
       }
+
+      /* eslint-enable no-fallthrough */
+
     });
   };