Merge pull request #5872 from IgniteUI/fix-5773-overlay-strategy-81x

fix(grid): Start using AutoPositionStrategy #5773

Author: DiyanDimitrov

projects/igniteui-angular/src/lib/core/styles/components/grid/_excel-filtering-theme.scss

@@ -12,7 +12,6 @@
 /// @requires --var
 @mixin _excel-filtering($theme, $palette) {
     %grid-excel-filter {
-        height: rem(15px);
         display: block;
     }
 

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

@@ -14,10 +14,10 @@ import {
 import {
     HorizontalAlignment,
     VerticalAlignment,
-    ConnectedPositioningStrategy,
     OverlaySettings,
     IgxOverlayService,
-    AbsoluteScrollStrategy
+    AbsoluteScrollStrategy,
+    AutoPositionStrategy
 } from '../../../services/index';
 import { IgxFilteringService, ExpressionUI } from '../grid-filtering.service';
 import { IgxToggleDirective } from '../../../directives/toggle/toggle.directive';
@@ -115,7 +115,7 @@ export class IgxGridExcelStyleFilteringComponent implements OnDestroy, OnInit, A
     private _subMenuOverlaySettings: OverlaySettings = {
         closeOnOutsideClick: true,
         modal: false,
-        positionStrategy: new ConnectedPositioningStrategy(this._subMenuPositionSettings),
+        positionStrategy: new AutoPositionStrategy(this._subMenuPositionSettings),
         scrollStrategy: new AbsoluteScrollStrategy()
     };