use previous directory command

Author: jjw24

Flow.Launcher/MainWindow.xaml.cs

@@ -18,6 +18,7 @@
 using NotifyIcon = System.Windows.Forms.NotifyIcon;
 using Flow.Launcher.Infrastructure;
 using Flow.Launcher.Infrastructure.Hotkey;
+using Flow.Launcher.Plugin.SharedCommands;
 
 namespace Flow.Launcher
 {
@@ -476,7 +477,7 @@ private void OnKeyDown(object sender, KeyEventArgs e)
                     {
                         if (_viewModel.SelectedIsFromQueryResults()
                             && QueryTextBox.CaretIndex == QueryTextBox.Text.Length
-                            && !string.IsNullOrEmpty(QueryTextBox.Text) && QueryTextBox.Text.Contains(":\\"))
+                            && FilesFolders.IsLocationPathString(QueryTextBox.Text))
                         {
 
                             _viewModel.BackspaceCommand.Execute(null);

Flow.Launcher/ViewModel/MainViewModel.cs

@@ -20,7 +20,6 @@
 using Microsoft.VisualStudio.Threading;
 using System.Threading.Channels;
 using ISavable = Flow.Launcher.Plugin.ISavable;
-using System.IO;
 
 namespace Flow.Launcher.ViewModel
 {
@@ -230,7 +229,10 @@ private void InitializeKeyCommands()
 
             BackspaceCommand = new RelayCommand(index =>
             {
-                ChangeQueryText(Path.GetDirectoryName(QueryText));
+                var path = QueryText;
+
+                // GetPreviousExistingDirectory does not require trailing '\', otherwise will return empty string
+                ChangeQueryText(FilesFolders.GetPreviousExistingDirectory(FilesFolders.IsLocationPathString, path.TrimEnd('\\')));
             });
 
             LoadContextMenuCommand = new RelayCommand(_ =>