Support hotkey modifiers

Author: VictoriousRaptor

Flow.Launcher/MainWindow.xaml

@@ -182,7 +182,8 @@
             Modifiers="Ctrl"/>
         <KeyBinding
             Key="{Binding TogglePreviewHotkey}"
-            Command="{Binding TogglePreviewCommand}"/>
+            Command="{Binding TogglePreviewCommand}"
+            Modifiers="{Binding TogglePreviewModifiers}"/>
     </Window.InputBindings>
     <Grid>
         <Border MouseDown="OnMouseDown" Style="{DynamicResource WindowBorderStyle}">

Flow.Launcher/ViewModel/MainViewModel.cs

@@ -23,6 +23,7 @@
 using System.Collections.Specialized;
 using CommunityToolkit.Mvvm.Input;
 using System.Globalization;
+using System.Windows.Input;
 
 namespace Flow.Launcher.ViewModel
 {
@@ -74,7 +75,7 @@ public MainViewModel(Settings settings)
                         OnPropertyChanged(nameof(OpenResultCommandModifiers));
                         break;
                     case nameof(Settings.PreviewHotkey):
-                        OnPropertyChanged(nameof(TogglePreviewHotkey));
+                        UpdatePreviewHotkey();
                         break;
                 }
             };
@@ -114,6 +115,7 @@ public MainViewModel(Settings settings)
             RegisterViewUpdate();
             RegisterResultsUpdatedEvent();
             _ = RegisterClockAndDateUpdateAsync();
+            UpdatePreviewHotkey();
         }
 
         private void RegisterViewUpdate()
@@ -582,7 +584,9 @@ public double MainWindowWidth
 
         public string OpenResultCommandModifiers => Settings.OpenResultModifiers;
 
-        public string TogglePreviewHotkey => Settings.PreviewHotkey; // TODO: is hotkey combo possible?
+        public Key TogglePreviewHotkey { get; set; }
+
+        public ModifierKeys TogglePreviewModifiers { get; set; } = ModifierKeys.None;
 
         public string Image => Constant.QueryTextBoxIconImagePath;
 
@@ -1014,6 +1018,14 @@ public bool ShouldIgnoreHotkeys()
             return Settings.IgnoreHotkeysOnFullscreen && WindowsInteropHelper.IsWindowFullscreen() || GameModeStatus;
         }
 
+        private void UpdatePreviewHotkey()
+        {
+            var converter = new KeyGestureConverter();
+            var key = (KeyGesture)converter.ConvertFromString(Settings.PreviewHotkey);
+            TogglePreviewHotkey = key.Key;
+            TogglePreviewModifiers = key.Modifiers;
+        }
+
         #endregion
 
         #region Public Methods