Expand flyout when pressing down key

Author: yaira2

src/Files.App.Controls/BreadcrumbBar/BreadcrumbBarItem.Events.cs

@@ -1,6 +1,9 @@
 // Copyright (c) Files Community
 // Licensed under the MIT License.
 
+using Microsoft.UI.Xaml.Input;
+using Windows.System;
+
 namespace Files.App.Controls
 {
 	public partial class BreadcrumbBarItem
@@ -15,6 +18,18 @@ private void ItemChevronButton_Click(object sender, RoutedEventArgs e)
 			FlyoutBase.ShowAttachedFlyout(_itemChevronButton);
 		}
 
+		private void ItemChevronButton_PreviewKeyDown(object sender, KeyRoutedEventArgs e)
+		{
+			if (e.Key == VirtualKey.Down)
+				FlyoutBase.ShowAttachedFlyout(_itemChevronButton);
+		}
+
+		private void ItemContentButton_PreviewKeyDown(object sender, KeyRoutedEventArgs e)
+		{
+			if (e.Key == VirtualKey.Down)
+				FlyoutBase.ShowAttachedFlyout(_itemChevronButton);
+		}
+
 		private void ChevronDropDownMenuFlyout_Opening(object? sender, object e)
 		{
 			if (_ownerRef is null ||

src/Files.App.Controls/BreadcrumbBar/BreadcrumbBarItem.cs

@@ -47,7 +47,9 @@ protected override void OnApplyTemplate()
 				VisualStateManager.GoToState(this, "ChevronCollapsed", true);
 
 			_itemContentButton.Click += ItemContentButton_Click;
+			_itemContentButton.PreviewKeyDown += ItemContentButton_PreviewKeyDown;
 			_itemChevronButton.Click += ItemChevronButton_Click;
+			_itemChevronButton.PreviewKeyDown += ItemChevronButton_PreviewKeyDown;
 			_itemChevronDropDownMenuFlyout.Opening += ChevronDropDownMenuFlyout_Opening;
 			_itemChevronDropDownMenuFlyout.Opened += ChevronDropDownMenuFlyout_Opened;
 			_itemChevronDropDownMenuFlyout.Closed += ChevronDropDownMenuFlyout_Closed;