Merge branch 'master' into bpenkov/date-range-disabled-onpush

Author: Lipata

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

@@ -1493,6 +1493,10 @@ export class IgxGridForOfDirective<T> extends IgxForOfDirective<T> implements On
                      NgFor only supports binding to Iterables such as Arrays.`);
                 }
             }
+            if (this.igxForScrollOrientation === 'horizontal') {
+                // in case collection has changes, reset sync service
+                this.syncService.setMaster(this, true);
+            }
         }
         const defaultItemSize = 'igxForItemSize';
         if (defaultItemSize in changes && !changes[defaultItemSize].firstChange &&

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

@@ -975,6 +975,29 @@ describe('IgxGrid - GroupBy #grid', () => {
         expect(rect.top).toEqual(origRect.top);
     });
 
+    it('should obtain correct virtualization state after all groups are collapsed and column is resized.', () => {
+        const fix = TestBed.createComponent(DefaultGridComponent);
+        const grid = fix.componentInstance.instance;
+        grid.groupsExpanded = false;
+        grid.columnWidth = '200px';
+        fix.detectChanges();
+
+        let fDataRow = grid.dataRowList.toArray()[0];
+        expect(fDataRow.virtDirRow.sizesCache[1]).toBe(200);
+
+        grid.groupBy({ fieldName: 'Released', dir: SortingDirection.Desc, ignoreCase: false });
+        fix.detectChanges();
+
+        grid.columns[0].width = '500px';
+        fix.detectChanges();
+        const groupRows = grid.groupsRowList.toArray();
+        groupRows[0].toggle();
+        fix.detectChanges();
+
+        fDataRow = grid.dataRowList.toArray()[0];
+        expect(fDataRow.virtDirRow.sizesCache[1]).toBe(500);
+    });
+
     // GroupBy + Filtering
     it('should filters by the data records and renders their related groups.', fakeAsync(() => {
         const fix = TestBed.createComponent(DefaultGridComponent);