fix(state-directive): clear previous selection setting state #9139

Author: hanastasov

projects/igniteui-angular/src/lib/grids/state.directive.spec.ts

@@ -360,7 +360,7 @@ describe('IgxGridState - input properties #grid', () => {
 
         let gridState = state.getState(true, 'rowSelection');
         expect(gridState).toBe(initialState);
-
+        state.setState('{"rowSelection":[2]}');
         state.setState(rowSelectionState);
         gridState = state.getState(false, 'rowSelection');
         HelperFunctions.verifyRowSelection(grid.selectedRows, gridState as IGridState);

projects/igniteui-angular/src/lib/grids/state.directive.ts

@@ -239,7 +239,7 @@ export class IgxGridStateDirective {
                 return { rowSelection: selection };
             },
             restoreFeatureState(context: IgxGridStateDirective, state: any[]): void {
-                context.currGrid.selectRows(state);
+                context.currGrid.selectRows(state, true);
             }
         },
         cellSelection: {