refactor(hgrid): Use columns collection to determine if it should recalculate grid sizes. (#12814)

Author: skrustev

projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-grid.component.ts

@@ -1114,7 +1114,7 @@ export class IgxHierarchicalGridComponent extends IgxHierarchicalGridBaseDirecti
         const childLayouts = this.parent ? this.childLayoutList : this.allLayoutList;
         const nestedColumns = childLayouts.map((layout) => layout.columnList.toArray());
         const colsArray = [].concat.apply([], nestedColumns);
-        const colLength = this.columnList.length;
+        const colLength = this.columns.length;
         const topCols = this.columnList.filter((item) => colsArray.indexOf(item) === -1);
         if (topCols.length > 0) {
             this.updateColumns(topCols);

projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-grid.spec.ts

@@ -2061,4 +2061,3 @@ export class IgxHierarchicalGridCustomRowEditOverlayComponent extends IgxHierarc
     </igx-hierarchical-grid>`
 })
 export class IgxHierarchicalGridAutoSizeColumnsComponent extends IgxHierarchicalGridTestBaseComponent {}
-