Fix digest issue with query part editor's actions menu (#21834)

(cherry picked from commit 1ef91e3fc4)

public/app/core/components/query_part/query_part_editor.ts

@@ -1,6 +1,7 @@
 import _ from 'lodash';
 import $ from 'jquery';
 import coreModule from 'app/core/core_module';
+import { promiseToDigest } from '../../utils/promiseToDigest';
 
 const template = `
 <div class="dropdown cascade-open">
@@ -138,9 +139,11 @@ export function queryPartEditorDirective(templateSrv: any) {
       }
 
       $scope.showActionsMenu = () => {
-        $scope.handleEvent({ $event: { name: 'get-part-actions' } }).then((res: any) => {
-          $scope.partActions = res;
-        });
+        promiseToDigest($scope)(
+          $scope.handleEvent({ $event: { name: 'get-part-actions' } }).then((res: any) => {
+            $scope.partActions = res;
+          })
+        );
       };
 
       $scope.triggerPartAction = (action: string) => {