Split discussion controls into three groups:

- user (reply, subscription)
- moderation (rename, sticky, tags)
- destructive (delete)

Will keep extension-added items organised nicely

framework/core/js/forum/src/initializers/discussion-controls.js

@@ -70,7 +70,7 @@ export default function(app) {
     }
   }
 
-  Discussion.prototype.controls = function(context) {
+  Discussion.prototype.userControls = function(context) {
     var items = new ItemList();
 
     if (context instanceof DiscussionPage) {
@@ -78,20 +78,42 @@ export default function(app) {
         ? ActionButton.component({ icon: 'reply', label: app.session.user() ? 'Reply' : 'Log In to Reply', onclick: this.replyAction.bind(this, true, false) })
         : ActionButton.component({ icon: 'reply', label: 'Can\'t Reply', className: 'disabled', title: 'You don\'t have permission to reply to this discussion.' })
       );
-
-      items.add('separator', Separator.component());
     }
 
+    return items;
+  };
+
+  Discussion.prototype.moderationControls = function(context) {
+    var items = new ItemList();
+
     if (this.canRename()) {
       items.add('rename', ActionButton.component({ icon: 'pencil', label: 'Rename', onclick: this.renameAction.bind(this) }));
     }
 
-    if (this.canDelete()) {
-      items.add('separator2', Separator.component());
+    return items;
+  };
 
+  Discussion.prototype.destructiveControls = function(context) {
+    var items = new ItemList();
+
+    if (this.canDelete()) {
       items.add('delete', ActionButton.component({ icon: 'times', label: 'Delete', onclick: this.deleteAction.bind(this) }));
     }
 
+    return items;
+  };
+
+  Discussion.prototype.controls = function(context) {
+    var items = new ItemList();
+
+    ['user', 'moderation', 'destructive'].forEach(section => {
+      var controls = this[section+'Controls'](context).toArray();
+      if (controls.length) {
+        items.add(section, controls);
+        items.add(section+'Separator', Separator.component());
+      }
+    });
+
     return items;
   }
 };

framework/core/js/lib/utils/item-list.js

@@ -59,7 +59,18 @@ export default class ItemList {
       }
     });
 
-    return array.map((item) => item.content);
+    array = array.map(item => item.content);
+
+    //recursively flatten array
+    for (var i = 0, len = array.length; i < len; i++) {
+      if (array[i] instanceof Array) {
+        array = array.concat.apply([], array);
+        i-- //check current index again and flatten until there are no more nested arrays at that index
+        len = array.length;
+      }
+    }
+
+    return array;
   }
 }