ignore iteration property when checking for unsaved changes

closes #11063

public/app/features/dashboard/specs/unsaved_changes_srv_specs.ts

@@ -66,6 +66,11 @@ describe('unsavedChangesSrv', function() {
     expect(tracker.hasChanges()).to.be(false);
   });
 
+  it('Should ignore .iteration changes', () => {
+    dash.iteration = new Date().getTime() + 1;
+    expect(tracker.hasChanges()).to.be(false);
+  });
+
   it.skip('Should ignore row collapse change', function() {
     dash.rows[0].collapse = true;
     expect(tracker.hasChanges()).to.be(false);

public/app/features/dashboard/unsaved_changes_srv.ts

@@ -97,6 +97,9 @@ export class Tracker {
     dash.refresh = 0;
     dash.schemaVersion = 0;
 
+    // ignore iteration property
+    delete dash.iteration;
+
     // filter row and panels properties that should be ignored
     dash.rows = _.filter(dash.rows, function(row) {
       if (row.repeatRowId) {