Move into nested docroot

web/core/misc/dialog/dialog.jquery-ui.js

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+/**
+ * @file
+ * Adds default classes to buttons for styling purposes.
+ */
+
+(function ($) {
+
+  'use strict';
+
+  $.widget('ui.dialog', $.ui.dialog, {
+    options: {
+      buttonClass: 'button',
+      buttonPrimaryClass: 'button--primary'
+    },
+    _createButtons: function () {
+      var opts = this.options;
+      var primaryIndex;
+      var $buttons;
+      var index;
+      var il = opts.buttons.length;
+      for (index = 0; index < il; index++) {
+        if (opts.buttons[index].primary && opts.buttons[index].primary === true) {
+          primaryIndex = index;
+          delete opts.buttons[index].primary;
+          break;
+        }
+      }
+      this._super();
+      $buttons = this.uiButtonSet.children().addClass(opts.buttonClass);
+      if (typeof primaryIndex !== 'undefined') {
+        $buttons.eq(index).addClass(opts.buttonPrimaryClass);
+      }
+    }
+  });
+
+})(jQuery);