Dashboards: It always detect changes when saving an existing dashboard (#76116)

Deep clone originalDashboard to avoid mutations by object reference

public/app/features/dashboard/state/DashboardModel.test.ts

@@ -1,7 +1,7 @@
 import { keys as _keys } from 'lodash';
 
 import { dateTime, TimeRange, VariableHide } from '@grafana/data';
-import { defaultVariableModel } from '@grafana/schema';
+import { Dashboard, defaultVariableModel } from '@grafana/schema';
 import { contextSrv } from 'app/core/services/context_srv';
 
 import { getDashboardModel } from '../../../../test/helpers/getDashboardModel';
@@ -52,6 +52,29 @@ describe('DashboardModel', () => {
     });
   });
 
+  describe('when storing original dashboard data', () => {
+    let originalDashboard: Dashboard = {
+      editable: true,
+      graphTooltip: 0,
+      schemaVersion: 1,
+      timezone: '',
+      title: 'original.title',
+    };
+    let model: DashboardModel;
+
+    beforeEach(() => {
+      model = new DashboardModel(originalDashboard);
+    });
+
+    it('should be returned from getOriginalDashboard without modifications', () => {
+      expect(model.getOriginalDashboard()).toEqual(originalDashboard);
+    });
+
+    it('should return a copy of the provided object', () => {
+      expect(model.getOriginalDashboard()).not.toBe(originalDashboard);
+    });
+  });
+
   describe('when getting next panel id', () => {
     let model: DashboardModel;
 

public/app/features/dashboard/state/DashboardModel.ts

@@ -24,6 +24,7 @@ import { GRID_CELL_HEIGHT, GRID_CELL_VMARGIN, GRID_COLUMN_COUNT, REPEAT_DIR_VERT
 import { contextSrv } from 'app/core/services/context_srv';
 import { sortedDeepCloneWithoutNulls } from 'app/core/utils/object';
 import { isAngularDatasourcePlugin } from 'app/features/plugins/angularDeprecation/utils';
+import { deepFreeze } from 'app/features/plugins/extensions/utils';
 import { variableAdapters } from 'app/features/variables/adapters';
 import { onTimeRangeUpdated } from 'app/features/variables/state/actions';
 import { GetVariables, getVariablesByKey } from 'app/features/variables/state/selectors';
@@ -172,7 +173,8 @@ export class DashboardModel implements TimeModel {
     this.links = data.links ?? [];
     this.gnetId = data.gnetId || null;
     this.panels = map(data.panels ?? [], (panelData: any) => new PanelModel(panelData));
-    this.originalDashboard = data;
+    // Deep clone original dashboard to avoid mutations by object reference
+    this.originalDashboard = cloneDeep(data);
     this.ensurePanelsHaveUniqueIds();
     this.formatDate = this.formatDate.bind(this);
 
@@ -1081,7 +1083,7 @@ export class DashboardModel implements TimeModel {
   }
 
   resetOriginalTime() {
-    this.originalTime = cloneDeep(this.time);
+    this.originalTime = deepFreeze(this.time);
   }
 
   hasTimeChanged() {
@@ -1267,8 +1269,8 @@ export class DashboardModel implements TimeModel {
     return variables.map((variable) => ({
       name: variable.name,
       type: variable.type,
-      current: cloneDeep(variable.current),
-      filters: cloneDeep(variable.filters),
+      current: deepFreeze(variable.current),
+      filters: deepFreeze(variable.filters),
     }));
   }