AppPageCtrl: Fix digest issue with app page initialisation (#21847)

public/app/features/plugins/plugin_page_ctrl.ts

@@ -6,6 +6,7 @@ import { PluginMeta } from '@grafana/data';
 import { NavModelSrv } from 'app/core/core';
 import { GrafanaRootScope } from 'app/routes/GrafanaCtrl';
 import { AppEvents } from '@grafana/data';
+import { promiseToDigest } from '../../core/utils/promiseToDigest';
 
 export class AppPageCtrl {
   page: any;
@@ -17,6 +18,7 @@ export class AppPageCtrl {
   constructor(private $routeParams: any, private $rootScope: GrafanaRootScope, private navModelSrv: NavModelSrv) {
     this.pluginId = $routeParams.pluginId;
 
+    promiseToDigest($rootScope)(
       Promise.resolve(getPluginSettings(this.pluginId))
         .then(settings => {
           this.initPage(settings);
@@ -24,7 +26,8 @@ export class AppPageCtrl {
         .catch(err => {
           this.$rootScope.appEvent(AppEvents.alertError, ['Unknown Plugin']);
           this.navModel = this.navModelSrv.getNotFoundNav();
-      });
+        })
+    );
   }
 
   initPage(app: PluginMeta) {