Add serialize and deserialize functionality to the itemStack.

spec/pane-spec.coffee

@@ -183,7 +183,8 @@ describe "Pane", ->
         pane.activateItem(itemD, true)
         expect(pane.getItems().map (item) -> item.name).toEqual ['A', 'B', 'D']
 
-  fdescribe "::activateMostRecentlyUsedItem()", ->
+
+  describe "::activateMostRecentlyUsedItem()", ->
     it "sets the active item to the most recently used item", ->
       pane = new Pane(paneParams(items: [new Item("A"), new Item("B"), new Item("C")]))
       [item1, item2, item3] = pane.getItems()
@@ -915,3 +916,30 @@ describe "Pane", ->
       pane.focus()
       newPane = Pane.deserialize(pane.serialize(), atom)
       expect(newPane.focused).toBe true
+
+    it "can serialize and deserialize the order of the items in the itemStack", ->
+      [item1, item2, item3] = pane.getItems()
+      pane.itemStack = [item3, item1, item2]
+      newPane = Pane.deserialize(pane.serialize(), atom)
+      expect(newPane.itemStack).toEqual pane.itemStack
+      expect(newPane.itemStack[2]).toEqual item2
+
+    it "builds the itemStack if the itemStack is not serialized", ->
+      [item1, item2, item3] = pane.getItems()
+      newPane = Pane.deserialize(pane.serialize(), atom)
+      expect(newPane.getItems()).toEqual newPane.itemStack
+
+    it "rebuilds the itemStack if items.length does not match itemStack.length", ->
+      [item1, item2, item3] = pane.getItems()
+      pane.itemStack = [item2, item3]
+      newPane = Pane.deserialize(pane.serialize(), atom)
+      expect(newPane.getItems()).toEqual newPane.itemStack
+
+    it "does not serialize items in the itemStack if they will not be serialized", ->
+      [item1, item2, item3] = pane.getItems()
+      pane.itemStack = [item2, item1, item3]
+      unserializable = {}
+      pane.activateItem(unserializable)
+
+      newPane = Pane.deserialize(pane.serialize(), atom)
+      expect(newPane.itemStack).toEqual [item2, item1, item3]

src/pane.coffee

@@ -20,7 +20,7 @@ class Pane extends Model
   focused: false
 
   @deserialize: (state, {deserializers, applicationDelegate, config, notifications}) ->
-    {items, activeItemURI, activeItemUri} = state
+    {items, itemStack, activeItemURI, activeItemUri} = state
     activeItemURI ?= activeItemUri
     state.items = compact(items.map (itemState) -> deserializers.deserialize(itemState))
     state.activeItem = find state.items, (item) ->
@@ -48,15 +48,20 @@ class Pane extends Model
 
     @addItems(compact(params?.items ? []))
     @setActiveItem(@items[0]) unless @getActiveItem()?
+    @addItemsToStack(params?.itemStack ? [])
     @setFlexScale(params?.flexScale ? 1)
 
   serialize: ->
     if typeof @activeItem?.getURI is 'function'
       activeItemURI = @activeItem.getURI()
+    itemStack = []
+    for item in @items
+      itemStack.push(@itemStack.indexOf(item)) if typeof item.serialize is 'function'
 
     deserializer: 'Pane'
     id: @id
     items: compact(@items.map((item) -> item.serialize?()))
+    itemStack: itemStack
     activeItemURI: activeItemURI
     focused: @focused
     flexScale: @flexScale
@@ -291,6 +296,14 @@ class Pane extends Model
       @emitter.emit 'did-change-active-item', @activeItem
     @activeItem
 
+  # Build the itemStack after deserializing
+  addItemsToStack: (itemStack) ->
+    if itemStack.length is 0 or itemStack.length isnt @items.length or itemStack.indexOf(-1) >= 0
+      itemStack = @items.map((item) => @items.indexOf(item))
+    for item, i in itemStack
+      index = itemStack.indexOf(i)
+      @addItemToStack(@items[index]) unless index is -1
+
   # Add item (or move item) to the end of the itemStack
   addItemToStack: (newItem) ->
     index = @itemStack.indexOf(newItem)
@@ -311,7 +324,6 @@ class Pane extends Model
 
   # Makes the most recently used item active.
   activateMostRecentlyUsedItem: ->
-    console.log(@items[0].serialize)
     if @items.length > 1
       index = @itemStack.length - 2
       mostRecentlyUsedItem = @itemStack[index]