prevent $scope.$apply from firing on every unsaved files check

only trigger a digest when there is a change in the saved state

services/web/public/coffee/ide/editor/controllers/SavingNotificationController.coffee

@@ -3,7 +3,7 @@ define [
 	"ide/editor/Document"
 ], (App, Document) ->
 	App.controller "SavingNotificationController", ["$scope", "$interval", "ide", ($scope, $interval, ide) ->
-		$interval () ->
+		setInterval () ->
 			pollSavedStatus()
 		, 1000
 
@@ -13,21 +13,25 @@ define [
 		$scope.docSavingStatus = {}
 		pollSavedStatus = () ->
 			oldStatus = $scope.docSavingStatus
-			$scope.docSavingStatus = {}
+			newStatus = {}
 
 			for doc_id, doc of Document.openDocs
 				saving = doc.pollSavedStatus()
 				if !saving
 					if oldStatus[doc_id]?
-						$scope.docSavingStatus[doc_id] = oldStatus[doc_id]
-						$scope.docSavingStatus[doc_id].unsavedSeconds += 1
+						newStatus[doc_id] = oldStatus[doc_id]
+						newStatus[doc_id].unsavedSeconds += 1
 					else
-						$scope.docSavingStatus[doc_id] = {
+						newStatus[doc_id] = {
 							unsavedSeconds: 0
 							doc: ide.fileTreeManager.findEntityById(doc_id)
 						}
 
+			if _.size(newStatus) or _.size(oldStatus)
+				$scope.docSavingStatus = newStatus
+				$scope.$apply()
+
 		warnAboutUnsavedChanges = () ->
 			if Document.hasUnsavedChanges()
 				return "You have unsaved changes. If you leave now they will not be saved."
-	]
+	]