chore(*): Fix issue with incorrect size cache beign used when initializing new dimension virtualization when scrolled.

Author: MKirova

projects/igniteui-angular/src/lib/directives/for-of/for_of.directive.ts

@@ -1625,7 +1625,7 @@ export class IgxGridForOfDirective<T> extends IgxForOfDirective<T> implements On
     }
 
     protected initSizesCache(items: any[]): number {
-        if (!this.syncService.isMaster(this)) {
+        if (!this.syncService.isMaster(this) && this.igxForScrollOrientation === 'horizontal') {
             const masterSizesCache = this.syncService.sizesCache(this.igxForScrollOrientation);
             return masterSizesCache[masterSizesCache.length - 1];
         }

src/app/pivot-grid/pivot-grid.sample.ts

@@ -158,7 +158,7 @@ export class PivotGridSampleComponent {
             {
                 memberName: 'SellerName',
                 enabled: true,
-                filter: this.filterExpTree
+                //filter: this.filterExpTree
             }
         ]
     };