prometheus: fixed unsaved changes warning when changing time range due to step option on query model was changed in datasource.query code, fixes #9675

public/app/features/dashboard/model.ts

@@ -35,7 +35,6 @@ export class DashboardModel {
   gnetId: any;
   meta: any;
   events: any;
-  editMode: boolean;
 
   constructor(data, meta?) {
     if (!data) {

public/app/features/dashboard/unsavedChangesSrv.js

@@ -73,7 +73,6 @@ function(angular, _) {
       dash.time = 0;
       dash.refresh = 0;
       dash.schemaVersion = 0;
-      dash.editMode = false;
 
       // filter row and panels properties that should be ignored
       dash.rows = _.filter(dash.rows, function(row) {

public/app/features/dashboard/viewStateSrv.js

@@ -155,7 +155,6 @@ function (angular, _, $, config) {
 
       ctrl.editMode = false;
       ctrl.fullscreen = false;
-      ctrl.dashboard.editMode = this.oldDashboardEditMode;
 
       this.$scope.appEvent('panel-fullscreen-exit', {panelId: ctrl.panel.id});
 
@@ -177,10 +176,8 @@ function (angular, _, $, config) {
       ctrl.editMode = this.state.edit && this.dashboard.meta.canEdit;
       ctrl.fullscreen = true;
 
-      this.oldDashboardEditMode = this.dashboard.editMode;
       this.oldTimeRange = ctrl.range;
       this.fullscreenPanel = panelScope;
-      this.dashboard.editMode = false;
 
       $(window).scrollTop(0);