Issue #3238863 by hooroomoo: Refactor (if feasible) uses of the jQuery merge...

Issue #3238863 by hooroomoo: Refactor (if feasible) uses of the jQuery merge function to use vanillaJS

core/.eslintrc.jquery.json

@@ -31,7 +31,7 @@
     "jquery/no-is": 0,
     "jquery/no-load": 2,
     "jquery/no-map": 0,
-    "jquery/no-merge": 0,
+    "jquery/no-merge": 2,
     "jquery/no-param": 2,
     "jquery/no-parent": 0,
     "jquery/no-parents": 0,

core/misc/tabledrag.es6.js

@@ -1320,7 +1320,7 @@
     if (this.indentEnabled) {
       this.indents = $tableRow.find('.js-indentation').length;
       this.children = this.findChildren(addClasses);
-      this.group = $.merge(this.group, this.children);
+      this.group = this.group.concat(this.children);
       // Find the depth of this entire group.
       for (let n = 0; n < this.group.length; n++) {
         this.groupDepth = Math.max(

core/misc/tabledrag.js

@@ -780,7 +780,7 @@ function _typeof(obj) { "@babel/helpers - typeof"; if (typeof Symbol === "functi
     if (this.indentEnabled) {
       this.indents = $tableRow.find('.js-indentation').length;
       this.children = this.findChildren(addClasses);
-      this.group = $.merge(this.group, this.children);
+      this.group = this.group.concat(this.children);
 
       for (var n = 0; n < this.group.length; n++) {
         this.groupDepth = Math.max($(this.group[n]).find('.js-indentation').length, this.groupDepth);