fix(RowSelectors): Fix integration with feature widths.

Author: MKirova

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

@@ -2520,6 +2520,14 @@ export class IgxGridBaseDirective extends DisplayDensityBase implements
         this.hideOverlays();
     }
 
+    /**
+    * @hidden
+    * @internal
+    */
+    public get headerFeaturesWidth() {
+        return this._headerFeaturesWidth;
+    }
+
     /**
     * @hidden
     * @internal

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

@@ -188,7 +188,7 @@
 </div>
 
 <div class="igx-grid__scroll" [style.height]="'18px'" #scr [hidden]="isHorizontalScrollHidden">
-    <div class="igx-grid__scroll-start" [style.width.px]='pinnedWidth' [style.min-width.px]='pinnedWidth' [hidden]="pinnedWidth === 0 || !isPinningToStart"></div>
+    <div class="igx-grid__scroll-start" [style.width.px]='pinnedWidth' [style.min-width.px]='isPinningToStart ? pinnedWidth : headerFeaturesWidth'></div>
     <div class="igx-grid__scroll-main" [style.width.px]='unpinnedWidth'>
         <ng-template igxGridFor [igxGridForOf]='[]' #scrollContainer>
         </ng-template>