PanelEditor: Fixed issue with PanelModel change plugin type (#23949)

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

@@ -214,10 +214,15 @@ describe('PanelModel', () => {
           });
         });
 
+        model.editSourceId = 1001;
         model.changePlugin(newPlugin);
         model.alert = { id: 2 };
       });
 
+      it('should keep editSourceId', () => {
+        expect(model.editSourceId).toBe(1001);
+      });
+
       it('should apply next panel option defaults', () => {
         expect(model.getOptions().showThresholdLabels).toBeFalsy();
         expect(model.getOptions().showThresholds).toBeUndefined();

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

@@ -84,6 +84,7 @@ const mustKeepProps: { [str: string]: boolean } = {
   queryRunner: true,
   transformations: true,
   fieldConfig: true,
+  editSourceId: true,
 };
 
 const defaults: any = {