Trigger events instead of calling cursor manager

This improves readability and prevents race conditions in compat
between Ace/CM

services/web/public/coffee/ide/editor/directives/aceEditor.coffee

@@ -308,13 +308,13 @@ define [
 						editor.renderer.updateFontSize()
 
 				scope.$watch "sharejsDoc", (sharejs_doc, old_sharejs_doc) ->
-					cursorPositionManager.onBeforeSessionChange(!!old_sharejs_doc)
-
 					if old_sharejs_doc?
+						scope.$broadcast('beforeChangeDocument')
 						detachFromAce(old_sharejs_doc)
-
 					if sharejs_doc?
 						attachToAce(sharejs_doc)
+					if sharejs_doc? and old_sharejs_doc?
+						scope.$broadcast('afterChangeDocument')
 
 				scope.$watch "text", (text) ->
 					if text?
@@ -391,7 +391,6 @@ define [
 					cursorPositionManager.onUnload(editor.getSession())
 
 				initCursorPosition = () ->
-					cursorPositionManager.init()
 					editor.on 'changeSession', onSessionChangeForCursorPosition
 					onSessionChangeForCursorPosition({ session: editor.getSession() }) # Force initial setup
 					$(window).on "unload", onUnloadForCursorPosition
@@ -400,6 +399,14 @@ define [
 					editor.off 'changeSession', onSessionChangeForCursorPosition
 					$(window).off "unload", onUnloadForCursorPosition
 
+				initCursorPosition()
+
+				# Trigger the event once *only* - this is called after Ace is connected
+				# to the ShareJs instance but this event should only be triggered the
+				# first time the editor is opened. Not every time the docs opened
+				triggerEditorInitEvent = _.once () ->
+					scope.$broadcast('editorInit')
+
 				attachToAce = (sharejs_doc) ->
 					lines = sharejs_doc.getSnapshot().split("\n")
 					session = editor.getSession()
@@ -445,8 +452,8 @@ define [
 					editor.initing = false
 					# now ready to edit document
 					editor.setReadOnly(scope.readOnly) # respect the readOnly setting, normally false
+					triggerEditorInitEvent()
 					initSpellCheck()
-					initCursorPosition()
 
 					resetScrollMargins()
 

services/web/public/coffee/ide/editor/directives/aceEditor/cursor-position/CursorPositionManager.coffee

@@ -1,6 +1,14 @@
 define [], () ->
 	class CursorPositionManager
 		constructor: (@$scope, @adapter, @localStorage) ->
+			@$scope.$on 'editorInit', @jumpToPositionInNewDoc
+
+			@$scope.$on 'beforeChangeDocument', () =>
+				@storeCursorPosition()
+				@storeFirstVisibleLine()
+
+			@$scope.$on 'afterChangeDocument', @jumpToPositionInNewDoc
+
 			@$scope.$on "#{@$scope.name}:gotoLine", (e, line, column) =>
 				if line?
 					setTimeout () =>
@@ -16,16 +24,8 @@ define [], () ->
 			@$scope.$on "#{@$scope.name}:clearSelection", (e) =>
 				@adapter.clearSelection()
 
-		init: () ->
+		jumpToPositionInNewDoc: () =>
-			@emitCursorUpdateEvent()
-
-		onBeforeSessionChange: (hasPrevSession = false) =>
-			if hasPrevSession
-				@storeCursorPosition()
-				@storeFirstVisibleLine()
-
 			@doc_id = @$scope.sharejsDoc?.doc_id
-
 			setTimeout () =>
 				@gotoStoredPosition()
 			, 0