fix(igxTreeGrid): Additional fixes for tree grid row pining and update test.

Author: skrustev

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

@@ -5194,7 +5194,7 @@ export class IgxGridBaseDirective extends DisplayDensityBase implements
     }
 
     /**
-     * Returns the currently transformed paged/filtered/sorted/grouped row data, displayed in the grid.
+     * Returns the currently transformed paged/filtered/sorted/grouped/pinned/unpinned row data, displayed in the grid.
      * @example
      * ```typescript
      *      const dataView = this.grid.dataView;
@@ -5446,7 +5446,7 @@ export class IgxGridBaseDirective extends DisplayDensityBase implements
      * If `headers` is enabled, it will use the column header (if any) instead of the column field.
      */
     public getSelectedData(formatters = false, headers = false) {
-        const source = this.dataView;
+        const source = this.filteredSortedData;
         return this.extractDataFromSelection(source, formatters, headers);
     }
 

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

@@ -1565,12 +1565,12 @@ describe('IgxTreeGrid - Integration #tGrid', () => {
             treeGrid.perPage = 5;
             fix.detectChanges();
 
-            expect(treeGrid.dataView.length).toBe(5);
+            expect(treeGrid.dataView.length).toBe(6);
 
             treeGrid.perPage = 10;
             fix.detectChanges();
 
-            expect(treeGrid.dataView.length).toBe(10);
+            expect(treeGrid.dataView.length).toBe(11);
         });
 
         it('should correctly apply paging state for grid and paginator when there are pinned rows.', fakeAsync(() => {

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

@@ -79,9 +79,9 @@
             | treeGridTransaction:id:pipeTrigger
             | visibleColumns:hasVisibleColumns
             | treeGridNormalizeRecord:pipeTrigger
+            | gridRowPinning:id:true:pipeTrigger
             | treeGridFiltering:filteringExpressionsTree:filterStrategy:advancedFilteringExpressionsTree:id:pipeTrigger:filteringPipeTrigger:true
-            | treeGridSorting:sortingExpressions:sortStrategy:id:pipeTrigger:true
-            | gridRowPinning:id:true:pipeTrigger as pinnedData'>
+            | treeGridSorting:sortingExpressions:sortStrategy:id:pipeTrigger:true as pinnedData'>
                 <div #pinContainer *ngIf='pinnedData.length > 0' 
                     [ngClass]="{
                         'igx-grid__tr--pinned-bottom':  !isRowPinningToTop,

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

@@ -640,7 +640,7 @@ export class IgxTreeGridComponent extends IgxGridBaseDirective implements GridTy
             source.push(record.data);
         };
 
-        this.dataView.forEach(process);
+        this.unpinnedDataView.forEach(process);
         source = this.isRowPinningToTop ? [...this.pinnedDataView, ...source] : [...source, ...this.pinnedDataView];
         return this.extractDataFromSelection(source, formatters, headers);
     }