feat(combo): Use AutoPositionStrategy #7225

Replace ConnectedPositioningStrategy with AutoPositionStrategy as component
default.

Author: IvayloG

CHANGELOG.md

@@ -2,6 +2,15 @@
 
 All notable changes for each version of this project will be documented in this file.
 
+## 10.1.0
+
+### General
+- `igxCombo`
+    - **Behavioral Change** - Change default positioning strategy from `ConnectedPositioningStrategy` to `AutoPositionStrategy`. The Auto strategy will initially try to show the element like the Connected strategy does. If the element goes out of the viewport Auto will flip the starting point and the direction, i.e. if the direction is 'bottom', it will switch it to 'top' and so on.
+
+### New Features
+
+
 ## 10.0.0
 
 ### General

projects/igniteui-angular/src/lib/combo/combo.component.ts

@@ -1,4 +1,3 @@
-import { ConnectedPositioningStrategy } from './../services/overlay/position/connected-positioning-strategy';
 import { CommonModule } from '@angular/common';
 import {
     AfterViewInit, ChangeDetectorRef, Component, ContentChild, ElementRef, EventEmitter, HostBinding, HostListener,
@@ -30,7 +29,7 @@ import { IgxInputGroupModule, IgxInputGroupComponent } from '../input-group/inpu
 import { IgxComboItemComponent } from './combo-item.component';
 import { IgxComboDropDownComponent } from './combo-dropdown.component';
 import { IgxComboFilteringPipe, IgxComboGroupingPipe } from './combo.pipes';
-import { OverlaySettings, AbsoluteScrollStrategy } from '../services/public_api';
+import { OverlaySettings, AbsoluteScrollStrategy, AutoPositionStrategy } from '../services/public_api';
 import { Subject } from 'rxjs';
 import { takeUntil } from 'rxjs/operators';
 import { DisplayDensityBase, DisplayDensityToken, IDisplayDensityOptions } from '../core/density';
@@ -156,7 +155,7 @@ export class IgxComboComponent extends DisplayDensityBase implements IgxComboBas
     private _onTouchedCallback: () => void = noop;
     private _overlaySettings: OverlaySettings = {
         scrollStrategy: new AbsoluteScrollStrategy(),
-        positionStrategy: new ConnectedPositioningStrategy(),
+        positionStrategy: new AutoPositionStrategy(),
         modal: false,
         closeOnOutsideClick: true,
         excludePositionTarget: true