Prevent adjacent menu separators

spec/context-menu-manager-spec.coffee

@@ -82,13 +82,15 @@ describe "ContextMenuManager", ->
       disposable1.dispose()
       expect(contextMenu.templateForElement(grandchild)).toEqual [{label: 'A', command: 'd'}]
 
-    it "allows multiple separators", ->
+    it "allows multiple separators, but not adjacent to each other", ->
       contextMenu.add
         '.grandchild': [
           {label: 'A', command: 'a'},
           {type: 'separator'},
+          {type: 'separator'},
           {label: 'B', command: 'b'},
           {type: 'separator'},
+          {type: 'separator'},
           {label: 'C', command: 'c'}
         ]
 

src/menu-helpers.coffee

@@ -13,7 +13,7 @@ merge = (menu, item, itemSpecificity=Infinity) ->
     else if itemSpecificity
       unless itemSpecificity < ItemSpecificities.get(matchingItem)
         menu[matchingItemIndex] = item
-  else
+  else unless item.type is 'separator' and _.last(menu)?.type is 'separator'
     menu.push(item)
 
 unmerge = (menu, item) ->