Feature: Improved (but hacky) context menu loading (#11966)

Author: hishitetsu

src/Files.App/App.xaml.cs

@@ -13,6 +13,7 @@
 using Files.App.ServicesImplementation;
 using Files.App.ServicesImplementation.DateTimeFormatter;
 using Files.App.ServicesImplementation.Settings;
+using Files.App.Shell;
 using Files.App.Storage.NativeStorage;
 using Files.App.UserControls.MultitaskingControl;
 using Files.App.ViewModels;
@@ -139,7 +140,8 @@ await Task.WhenAll(
 
 				await Task.WhenAll(
 					JumpListHelper.InitializeUpdatesAsync(),
-					addItemService.GetNewEntriesAsync()
+					addItemService.GetNewEntriesAsync(),
+					ContextMenu.WarmUpQueryContextMenuAsync()
 				);
 
 				FileTagsHelper.UpdateTagsDb();

src/Files.App/Shell/ContextMenu.cs

@@ -163,6 +163,19 @@ public async Task InvokeItem(int itemID)
 			}
 		}
 
+		public static async Task WarmUpQueryContextMenuAsync()
+		{
+			var thread = new ThreadWithMessageQueue();
+			await thread.PostMethod(() =>
+			{
+				// Create a dummy context menu for warming up
+				var shellItem = ShellFolderExtensions.GetShellItemFromPathOrPidl("C:\\");
+				Shell32.IContextMenu menu = shellItem.Parent.GetChildrenUIObjects<Shell32.IContextMenu>(default, shellItem);
+				menu.QueryContextMenu(User32.CreatePopupMenu(), 0, 1, 0x7FFF, Shell32.CMF.CMF_NORMAL);
+			});
+			thread.Dispose();
+		}
+
 		#endregion FactoryMethods
 
 		private void EnumMenuItems(