Refactor saving cursor position to not use Ace event

This is will help with triggering CM correctly

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

@@ -308,6 +308,8 @@ define [
 						editor.renderer.updateFontSize()
 
 				scope.$watch "sharejsDoc", (sharejs_doc, old_sharejs_doc) ->
+					cursorPositionManager.onBeforeSessionChange(!!old_sharejs_doc)
+
 					if old_sharejs_doc?
 						detachFromAce(old_sharejs_doc)
 
@@ -382,7 +384,6 @@ define [
 					editor.off 'nativecontextmenu', spellCheckManager.onContextMenu
 
 				onSessionChangeForCursorPosition = (e) ->
-					cursorPositionManager.onSessionChange(e)
 					e.oldSession?.selection.off 'changeCursor', cursorPositionManager.onCursorChange
 					e.session.selection.on 'changeCursor', cursorPositionManager.onCursorChange
 

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

@@ -19,9 +19,9 @@ define [], () ->
 		init: () ->
 			@emitCursorUpdateEvent()
 
-		onSessionChange: (e) =>
-			if e.oldSession?
-				@storeCursorPosition(e.oldSession)
+		onBeforeSessionChange: (hasPrevSession = false) =>
+			if hasPrevSession
+				@storeCursorPosition()
 				@storeFirstVisibleLine()
 
 			@doc_id = @$scope.sharejsDoc?.doc_id
@@ -30,8 +30,8 @@ define [], () ->
 				@gotoStoredPosition()
 			, 0
 
-		onUnload: (session) =>
-			@storeCursorPosition(session)
+		onUnload: () =>
+			@storeCursorPosition()
 			@storeFirstVisibleLine()
 
 		onCursorChange: () =>
@@ -43,10 +43,10 @@ define [], () ->
 				docPosition.firstVisibleLine = @adapter.getEditorScrollPosition()
 				@localStorage("doc.position.#{@doc_id}", docPosition)
 
-		storeCursorPosition: (session) ->
+		storeCursorPosition: () ->
 			if @doc_id?
 				docPosition = @localStorage("doc.position.#{@doc_id}") || {}
-				docPosition.cursorPosition = @adapter.getCursorForSession(session)
+				docPosition.cursorPosition = @adapter.getCursor()
 				@localStorage("doc.position.#{@doc_id}", docPosition)
 
 		emitCursorUpdateEvent: () ->