When an EditSession is removed, remove its tab

src/extensions/tabs/spec/tabs-spec.coffee

@@ -52,3 +52,10 @@ fdescribe "Tabs", ->
       rootView.open('two-hundred.txt')
       expect(tabs.find('.tab').length).toBe 3
       expect(tabs.find('.tab:eq(2) .file-name').text()).toBe 'two-hundred.txt'
+
+  describe "when an edit session is removed", ->
+    it "removes the tab for the removed edit session", ->
+      editor.setActiveEditSessionIndex(0)
+      editor.destroyActiveEditSession()
+      expect(tabs.find('.tab').length).toBe 1
+      expect(tabs.find('.tab:eq(0) .file-name').text()).toBe 'sample.txt'

src/extensions/tabs/src/tabs.coffee

@@ -25,6 +25,7 @@ class Tabs extends View
     @setActiveTab(@editor.getActiveEditSessionIndex())
     @editor.on 'editor:active-edit-session-changed', (e, editSession, index) => @setActiveTab(index)
     @editor.on 'editor:edit-session-added', (e, editSession) => @addTabForEditSession(editSession)
+    @editor.on 'editor:edit-session-removed', (e, editSession, index) => @removeTabAtIndex(index)
 
   addTabForEditSession: (editSession) ->
     @append $$ ->
@@ -34,3 +35,6 @@ class Tabs extends View
   setActiveTab: (index) ->
     @find(".tab.active").removeClass('active')
     @find(".tab:eq(#{index})").addClass('active')
+
+  removeTabAtIndex: (index) ->
+    @find(".tab:eq(#{index})").remove()