Feature: Open folder in new tab when dragging folder to "add tab" button

src/Files.App/Views/MainPage.xaml

@@ -155,10 +155,13 @@
 						Padding="8"
 						HorizontalAlignment="Left"
 						VerticalAlignment="Bottom"
+						AllowDrop="True"
 						AutomationProperties.Name="{x:Bind Commands.NewTab.AutomationName}"
 						Background="Transparent"
 						BorderThickness="0"
 						Command="{x:Bind Commands.NewTab}"
+						DragOver="HorizontalMultitaskingControlAddButton_DragOver"
+						Drop="HorizontalMultitaskingControlAddButton_Drop"
 						ToolTipService.ToolTip="{x:Bind Commands.NewTab.LabelWithHotKey, Mode=OneWay}">
 						<Button.Content>
 							<FontIcon

src/Files.App/Views/MainPage.xaml.cs

@@ -12,7 +12,9 @@
 using Microsoft.UI.Xaml.Controls;
 using Microsoft.UI.Xaml.Input;
 using Microsoft.UI.Xaml.Navigation;
+using System.Data;
 using Windows.ApplicationModel;
+using Windows.ApplicationModel.DataTransfer;
 using Windows.Foundation.Metadata;
 using Windows.Services.Store;
 using WinRT.Interop;
@@ -175,10 +177,10 @@ public void MultitaskingControl_CurrentInstanceChanged(object? sender, CurrentIn
 				SidebarAdaptiveViewModel.PaneHolder.PropertyChanged -= PaneHolder_PropertyChanged;
 
 			var navArgs = e.CurrentInstance.TabItemParameter?.NavigationParameter;
-            if (e.CurrentInstance is IPaneHolder currentInstance)
-            {
-                SidebarAdaptiveViewModel.PaneHolder = currentInstance;
-                SidebarAdaptiveViewModel.PaneHolder.PropertyChanged += PaneHolder_PropertyChanged;
+			if (e.CurrentInstance is IPaneHolder currentInstance)
+			{
+				SidebarAdaptiveViewModel.PaneHolder = currentInstance;
+				SidebarAdaptiveViewModel.PaneHolder.PropertyChanged += PaneHolder_PropertyChanged;
 			}
 			SidebarAdaptiveViewModel.NotifyInstanceRelatedPropertiesChanged((navArgs as PaneNavigationArguments)?.LeftPaneNavPathParam);
 
@@ -474,6 +476,64 @@ private void RootGrid_PreviewKeyDown(object sender, KeyRoutedEventArgs e)
 			}
 		}
 
+		private bool lockFlag = false;
+		//private string[] dropableArchiveTypes = { "zip", "rar", "7z", "tar" };
+
+		private async void HorizontalMultitaskingControlAddButton_Drop(object sender, DragEventArgs e)
+		{
+			if (lockFlag || !FilesystemHelpers.HasDraggedStorageItems(e.DataView))
+				return;
+
+			lockFlag = true;
+
+			var items = (await FilesystemHelpers.GetDraggedStorageItems(e.DataView))
+				.Where(x => x.ItemType is FilesystemItemType.Directory
+				//|| dropableArchiveTypes.Contains(x.Name.Split('.').Last().ToLower())
+				);
+
+			var deferral = e.GetDeferral();
+			try
+			{
+				foreach (var item in items)
+					await NavigationHelpers.OpenPathInNewTab(item.Path);
+
+				deferral.Complete();
+			}
+			catch { }
+			lockFlag = false;
+		}
+
+		private async void HorizontalMultitaskingControlAddButton_DragOver(object sender, DragEventArgs e)
+		{
+			if (!FilesystemHelpers.HasDraggedStorageItems(e.DataView))
+			{
+				e.AcceptedOperation = DataPackageOperation.None;
+				return;
+			}
+
+			bool hasValidDraggedItems =
+				(await FilesystemHelpers.GetDraggedStorageItems(e.DataView)).Any(x => x.ItemType is FilesystemItemType.Directory
+				//|| dropableArchiveTypes.Contains(x.Name.Split('.').Last().ToLower())
+				);
+
+			if (!hasValidDraggedItems)
+			{
+				e.AcceptedOperation = DataPackageOperation.None;
+				return;
+			}
+
+			try
+			{
+				e.Handled = true;
+				var deferral = e.GetDeferral();
+				e.DragUIOverride.IsCaptionVisible = true;
+				e.DragUIOverride.Caption = string.Format("OpenInNewTab".GetLocalizedResource());
+				e.AcceptedOperation = DataPackageOperation.Link;
+				deferral.Complete();
+			}
+			catch { }
+		}
+
 		private void NavToolbar_Loaded(object sender, RoutedEventArgs e) => UpdateNavToolbarProperties();
 
 		private void PaneSplitter_ManipulationStarted(object sender, ManipulationStartedRoutedEventArgs e)