Unsubscribe from Buffer when an Editor is removed from the DOM.

spec/atom/editor-spec.coffee

@@ -896,6 +896,19 @@ describe "Editor", ->
       editor.attachToDom()
       expect(editor).toMatchSelector ":has(:focus)"
 
+    it "unsubscribes from the buffer when it is removed from the dom", ->
+      buffer = new Buffer
+      previousSubscriptionCount = buffer.subscriptionCount()
+
+      editor.attachToDom()
+      editor.setBuffer(buffer)
+
+      expect(buffer.subscriptionCount()).toBeGreaterThan previousSubscriptionCount
+      expect($('.editor')).toExist()
+      editor.remove()
+      expect(buffer.subscriptionCount()).toBe previousSubscriptionCount
+      expect($('.editor')).not.toExist()
+
   describe "when the editor recieves focused", ->
     it "focuses the hidden input", ->
       editor.attachToDom()

src/atom/editor.coffee

@@ -165,8 +165,7 @@ class Editor extends View
   setBuffer: (buffer) ->
     if @buffer
       @saveEditSession()
-      @buffer.off ".editor#{@id}"
-      @renderer.destroy()
+      @unsubscribeFromBuffer()
 
     @buffer = buffer
 
@@ -397,3 +396,11 @@ class Editor extends View
 
   logLines: ->
     @renderer.logLines()
+
+  remove: ->
+    @unsubscribeFromBuffer()
+    super
+
+  unsubscribeFromBuffer: ->
+    @buffer.off ".editor#{@id}"
+    @renderer.destroy()