chore(*): Small review comments.

Author: MKirova

projects/igniteui-angular/src/lib/grids/grid-base.directive.ts

@@ -4083,12 +4083,7 @@ export abstract class IgxGridBaseDirective implements GridType,
     }
 
     protected get hasCellsToMerge() {
-        const columnToMerge = this.visibleColumns.filter(
-            x => x.merge && (this.cellMergeMode ==='always' ||
-            (this.cellMergeMode === 'onSort' && !!this.sortingExpressions
-                .find(y => y.fieldName === x.field)))
-        );
-        return columnToMerge.length > 0;
+        return this.columnsToMerge.length > 0;
     }
 
     /**

projects/igniteui-angular/src/lib/grids/grid/grid-row.component.html

@@ -171,7 +171,6 @@
 
 <ng-template #expandableCellTemplate let-col>
     <igx-expandable-grid-cell
-        [class.igx-grid__td--merged]="metaData?.cellMergeMeta.get(col.field)?.rowSpan > 1"
         [class.igx-grid__td--merged]="metaData?.cellMergeMeta.get(col.field)?.rowSpan > 1"
         [class.igx-grid__td--merged-selected]="isSelectionRoot(col)"
         [class.igx-grid__td--merged-hovered]="isHoveredRoot(col)"