Fix: Fixed issue with selecting multiple items in column layout (#12515)

Author: yaira2

src/Files.App/Views/LayoutModes/ColumnViewBase.xaml.cs

@@ -222,6 +222,13 @@ protected override void FileList_SelectionChanged(object sender, SelectionChange
 				var presenter = openedFolderPresenter.FindDescendant<Grid>()!;
 				presenter!.Background = this.Resources["ListViewItemBackgroundSelected"] as SolidColorBrush;
 			}
+
+			if (SelectedItems?.Count > 1 || SelectedItem?.PrimaryItemAttribute is StorageItemTypes.File)
+			{
+				var currentBladeIndex = (ParentShellPageInstance is ColumnShellPage associatedColumnShellPage) ? associatedColumnShellPage.ColumnParams.Column : 0;
+				this.FindAscendant<ColumnViewBrowser>()?.DismissOtherBlades(currentBladeIndex);
+				ClearOpenedFolderSelectionIndicator();
+			}
 		}
 
 		private void FileList_RightTapped(object sender, RightTappedRoutedEventArgs e)
@@ -237,7 +244,12 @@ private void HandleRightClick(object sender, RightTappedRoutedEventArgs e)
 
 		private void FileList_PreviewKeyUp(object sender, KeyRoutedEventArgs e)
 		{
-			if (IsRenamingItem || !(e.Key is VirtualKey.Up or VirtualKey.Down or VirtualKey.Right))
+			if
+			(
+				IsRenamingItem ||
+				!(e.Key is VirtualKey.Up or VirtualKey.Down or VirtualKey.Right) ||
+				SelectedItems?.Count > 1
+			)
 				return;
 
 			// Open selected directory
@@ -247,7 +259,12 @@ private void FileList_PreviewKeyUp(object sender, KeyRoutedEventArgs e)
 
 		protected override async void FileList_PreviewKeyDown(object sender, KeyRoutedEventArgs e)
 		{
-			if (ParentShellPageInstance is null || IsRenamingItem)
+			if
+			(
+				ParentShellPageInstance is null ||
+				IsRenamingItem ||
+				SelectedItems?.Count > 1
+			)
 				return;
 
 			var ctrlPressed = InputKeyboardSource.GetKeyStateForCurrentThread(VirtualKey.Control).HasFlag(CoreVirtualKeyStates.Down);

src/Files.App/Views/LayoutModes/ColumnViewBrowser.xaml.cs

@@ -184,7 +184,7 @@ private void DismissOtherBlades(BladeItem blade)
 			DismissOtherBlades(ColumnHost.ActiveBlades.IndexOf(blade));
 		}
 
-		private void DismissOtherBlades(int index)
+		public void DismissOtherBlades(int index)
 		{
 			if (index >= 0)
 			{