Warn if trying to add existing shortcut

1. Warn if trying to add existing shortcut

Author: VictoriousRaptor

Flow.Launcher.Infrastructure/UserSettings/Settings.cs

@@ -175,6 +175,7 @@ public string QuerySearchPrecisionString
 
 
         public ObservableCollection<CustomPluginHotkey> CustomPluginHotkeys { get; set; } = new ObservableCollection<CustomPluginHotkey>();
+        public ObservableCollection<CustomShortcutModel> CustomShortcuts { get; set; } = new ObservableCollection<CustomShortcutModel>();
 
         public bool DontPromptUpdateMsg { get; set; }
         public bool EnableUpdateLog { get; set; }
@@ -204,7 +205,6 @@ public bool HideNotifyIcon
 
         // This needs to be loaded last by staying at the bottom
         public PluginsSettings PluginSettings { get; set; } = new PluginsSettings();
-        internal ObservableCollection<CustomShortcutModel> CustomShortcuts { get; set; } = new();
     }
 
     public enum LastQueryMode

Flow.Launcher/SettingWindow.xaml.cs

@@ -415,6 +415,11 @@ private void OnAddCustomeShortCutClick(object sender, RoutedEventArgs e)
             var shortcutSettingWindow = new CustomShortcutSetting();
             if (shortcutSettingWindow.ShowDialog() == true)
             {
+                if (settings.CustomShortcuts.Contains(shortcutSettingWindow.ShortCut))
+                {
+                    MessageBox.Show("Dulplicate shortcut");
+                    return;
+                }
                 settings.CustomShortcuts.Add(shortcutSettingWindow.ShortCut);
             }
         }