Remove all redundant separators

spec/context-menu-manager-spec.coffee

@@ -149,7 +149,7 @@ describe "ContextMenuManager", ->
       shouldDisplay = false
       expect(contextMenu.templateForEvent(dispatchedEvent)).toEqual []
 
-    it "prunes a trailing separator", ->
+    fit "prunes a trailing separator", ->
       contextMenu.add
         '.grandchild': [
           {label: 'A', command: 'a'},
@@ -160,6 +160,44 @@ describe "ContextMenuManager", ->
 
       expect(contextMenu.templateForEvent({target: grandchild}).length).toBe(3)
 
+    fit "prunes a leading separator", ->
+      contextMenu.add
+        '.grandchild': [
+          {type: 'separator'},
+          {label: 'A', command: 'a'},
+          {type: 'separator'},
+          {label: 'B', command: 'b'}
+        ]
+
+      expect(contextMenu.templateForEvent({target: grandchild}).length).toBe(3)
+
+    fit "prunes duplicate separators", ->
+      contextMenu.add
+        '.grandchild': [
+          {label: 'A', command: 'a'},
+          {type: 'separator'},
+          {type: 'separator'},
+          {label: 'B', command: 'b'}
+        ]
+
+      expect(contextMenu.templateForEvent({target: grandchild}).length).toBe(3)
+
+    fit "prunes all redundant separators", ->
+      contextMenu.add
+        '.grandchild': [
+          {type: 'separator'},
+          {type: 'separator'},
+          {label: 'A', command: 'a'},
+          {type: 'separator'},
+          {type: 'separator'},
+          {label: 'B', command: 'b'}
+          {label: 'C', command: 'c'}
+          {type: 'separator'},
+          {type: 'separator'},
+        ]
+
+      expect(contextMenu.templateForEvent({target: grandchild}).length).toBe(4)
+
     it "throws an error when the selector is invalid", ->
       addError = null
       try

src/context-menu-manager.coffee

@@ -145,12 +145,23 @@ class ContextMenuManager
 
       currentTarget = currentTarget.parentElement
 
-    # Remove trailing separator
-    if template.length > 0 and template[template.length - 1].type is 'separator'
-      template.splice(template.length-1, 1)
+    @pruneRedundantSeparators(template)
 
     template
 
+  pruneRedundantSeparators: (menu) ->
+    keepNextItemIfSeparator = false
+    index = 0
+    while index < menu.length
+      if menu[index].type is 'separator'
+        if not keepNextItemIfSeparator or index is menu.length - 1
+          menu.splice(index, 1)
+        else
+          index++
+      else
+        keepNextItemIfSeparator = true
+        index++
+
   # Returns an object compatible with `::add()` or `null`.
   cloneItemForEvent: (item, event) ->
     return null if item.devMode and not @devMode