Return subscription from RootView.eachEditor()

spec/app/root-view-spec.coffee

@@ -327,6 +327,18 @@ describe "RootView", ->
       expect(count).toBe 1
       expect(callbackEditor).toBe rootView.getActiveView()
 
+    it "returns a subscription that can be disabled", ->
+      count = 0
+      callback = (editor) -> count++
+
+      subscription = rootView.eachEditor(callback)
+      expect(count).toBe 1
+      rootView.getActiveView().splitRight()
+      expect(count).toBe 2
+      subscription.off()
+      rootView.getActiveView().splitRight()
+      expect(count).toBe 2
+
   describe ".eachBuffer(callback)", ->
     beforeEach ->
       rootView.attachToDom()

src/app/root-view.coffee

@@ -205,7 +205,9 @@ class RootView extends View
   # callback - A {Function} to call
   eachEditor: (callback) ->
     callback(editor) for editor in @getEditors()
-    @on 'editor:attached', (e, editor) -> callback(editor)
+    attachedCallback = (e, editor) -> callback(editor)
+    @on('editor:attached', attachedCallback)
+    off: => @off('editor:attached', attachedCallback)
 
   # Fires a callback on each open {EditSession}.
   #