Namespaced sortable default options function

app/assets/javascripts/boards/components/board.js.es6

@@ -47,7 +47,7 @@
       }
     },
     ready () {
-      const options = gl.getBoardSortableDefaultOptions({
+      const options = gl.issueBoards.getBoardSortableDefaultOptions({
         disabled: this.disabled,
         group: 'boards',
         draggable: '.is-draggable',

app/assets/javascripts/boards/components/board_list.js.es6

@@ -44,7 +44,7 @@
       },
     },
     ready () {
-      const options = gl.getBoardSortableDefaultOptions({
+      const options = gl.issueBoards.getBoardSortableDefaultOptions({
           group: 'issues',
           sort: false,
           disabled: this.disabled,

app/assets/javascripts/boards/mixins/sortable_default_options.js.es6

 ((w) => {
-  if (!window.gl) {
-    window.gl = {};
-  }
+  window.gl = window.gl || {};
+  window.gl.issueBoards = window.gl.issueBoards || {};
 
-  gl.getBoardSortableDefaultOptions = (obj) => {
+  gl.issueBoards.getBoardSortableDefaultOptions = (obj) => {
     let defaultSortOptions = {
       forceFallback: true,
       fallbackClass: 'is-dragging',