Merge branch '9.1.x' into ibarakov/fix-8372-9.1.x

Author: igdmdimitrov

projects/igniteui-angular/src/lib/grids/filtering/excel-style/grid.excel-style-filtering.component.ts

@@ -616,7 +616,7 @@ export class IgxGridExcelStyleFilteringComponent implements OnDestroy {
 
     private generateUniqueValues(columnValues: any[]) {
         if (this.column.dataType === DataType.String && this.column.filteringIgnoreCase) {
-            const filteredUniqueValues = columnValues.map(s => s?.toLowerCase())
+            const filteredUniqueValues = columnValues.map(s => s?.toString().toLowerCase())
                 .reduce((map, val, i) => map.get(val) ? map : map.set(val, columnValues[i]),
                 new Map);
 

projects/igniteui-angular/src/lib/grids/grid-navigation.service.ts

@@ -183,7 +183,7 @@ export class IgxGridNavigationService {
     }
 
     focusFirstCell(header = true) {
-        if (this.grid.dataView.length && this.activeNode &&
+        if ((header || this.grid.dataView.length) && this.activeNode &&
             (this.activeNode.row === -1 || this.activeNode.row === this.grid.dataView.length)) { return; }
         this.activeNode = { row: header ? -1 : this.grid.dataView.length, column: 0,
                 level: this.grid.hasColumnLayouts ? 1 : 0, mchCache: { level: 0, visibleIndex: 0} };