chore(*): Allows row expansion & changes default pinned row expansion behavior

Author: 3phase

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

@@ -79,7 +79,7 @@
             <ng-container *ngFor="let rowData of data
                 | visibleColumns:hasVisibleColumns
                 | treeGridRowPinning:id:pipeTrigger
-                | treeGridHierarchizing:primaryKey:foreignKey:childDataKey:id:pipeTrigger
+                | treeGridHierarchizing:primaryKey:foreignKey:childDataKey:id:true:pipeTrigger
                 | treeGridFiltering:filteringExpressionsTree:filterStrategy:advancedFilteringExpressionsTree:id:pipeTrigger:filteringPipeTrigger
                 | treeGridSorting:sortingExpressions:sortStrategy:id:pipeTrigger; let rowIndex = index">
                 <ng-container *ngTemplateOutlet="record_template; context: getContext(rowData, rowIndex, true)">
@@ -93,7 +93,7 @@
         <ng-template igxGridFor let-rowData [igxGridForOf]="data
         | treeGridTransaction:id:pipeTrigger
         | visibleColumns:hasVisibleColumns
-        | treeGridHierarchizing:primaryKey:foreignKey:childDataKey:id:pipeTrigger
+        | treeGridHierarchizing:primaryKey:foreignKey:childDataKey:id:false:pipeTrigger
         | treeGridShadowRows:id:pipeTrigger
         | treeGridFiltering:filteringExpressionsTree:filterStrategy:advancedFilteringExpressionsTree:id:pipeTrigger:filteringPipeTrigger
         | treeGridSorting:sortingExpressions:sortStrategy:id:pipeTrigger

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

@@ -25,7 +25,7 @@ export class IgxTreeGridHierarchizingPipe implements PipeTransform {
     }
 
     public transform(collection: any[], primaryKey: string, foreignKey: string, childDataKey: string,
-        id: string, pipeTrigger: number): ITreeGridRecord[] {
+        id: string, pinned: boolean = false, pipeTrigger: number): ITreeGridRecord[] {
         const grid = this.gridAPI.grid;
         let hierarchicalRecords: ITreeGridRecord[] = [];
         const treeGridRecordsMap = new Map<any, ITreeGridRecord>();
@@ -39,7 +39,7 @@ export class IgxTreeGridHierarchizingPipe implements PipeTransform {
         }
 
         grid.flatData = flatData;
-        grid.records = treeGridRecordsMap;
+        grid.records = (pinned) ? grid.records : treeGridRecordsMap;
         grid.rootRecords = hierarchicalRecords;
         return hierarchicalRecords;
     }
@@ -168,11 +168,7 @@ export class IgxTreeGridFlatteningPipe implements PipeTransform {
                 data.push(hierarchicalRecord);
             }
 
-            const pinnedRow = this.gridAPI.get_row_by_key(hierarchicalRecord.rowID) !== undefined ?
-                    this.gridAPI.get_row_by_key(hierarchicalRecord.rowID).pinned :
-                    false;
-
-            hierarchicalRecord.expanded = this.gridAPI.get_row_expansion_state(hierarchicalRecord) || pinnedRow;
+            hierarchicalRecord.expanded = this.gridAPI.get_row_expansion_state(hierarchicalRecord);
 
             this.updateNonProcessedRecordExpansion(grid, hierarchicalRecord);