Revert changes to mainpage

Author: yaira2

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

@@ -126,9 +126,7 @@ private void UserSettingsService_OnSettingChangedEvent(object? sender, SettingCh
 
 		private void HorizontalMultitaskingControl_Loaded(object sender, RoutedEventArgs e)
 		{
-			TabControl.DragArea.SizeChanged += (_, _) => MainWindow.Instance.RaiseSetTitleBarDragRegion(TabControl.SetTitleBarDragRegion);
-			TabControl.SizeChanged += (_, _) => MainWindow.Instance.RaiseSetTitleBarDragRegion(TabControl.SetTitleBarDragRegion);
-
+			TabControl.DragArea.SizeChanged += (_, _) => MainWindow.Instance.RaiseSetTitleBarDragRegion(SetTitleBarDragRegion);
 			if (ViewModel.MultitaskingControl is not TabBar)
 			{
 				ViewModel.MultitaskingControl = TabControl;
@@ -137,6 +135,13 @@ private void HorizontalMultitaskingControl_Loaded(object sender, RoutedEventArgs
 			}
 		}
 
+		private int SetTitleBarDragRegion(InputNonClientPointerSource source, SizeInt32 size, double scaleFactor, Func<UIElement, RectInt32?, RectInt32> getScaledRect)
+		{
+			var height = (int)TabControl.ActualHeight;
+			source.SetRegionRects(NonClientRegionKind.Passthrough, [getScaledRect(this, new RectInt32(0, 0, (int)(TabControl.ActualWidth + TabControl.Margin.Left - TabControl.DragArea.ActualWidth), height))]);
+			return height;
+		}
+
 		public async void TabItemContent_ContentChanged(object? sender, TabBarItemParameter e)
 		{
 			if (SidebarAdaptiveViewModel.PaneHolder is null)
@@ -274,7 +279,7 @@ protected override void OnLostFocus(RoutedEventArgs e)
 
 		private void Page_Loaded(object sender, RoutedEventArgs e)
 		{
-			MainWindow.Instance.AppWindow.Changed += (_, _) => MainWindow.Instance.RaiseSetTitleBarDragRegion(TabControl.SetTitleBarDragRegion);
+			MainWindow.Instance.AppWindow.Changed += (_, _) => MainWindow.Instance.RaiseSetTitleBarDragRegion(SetTitleBarDragRegion);
 
 			// Defers the status bar loading until after the page has loaded to improve startup perf
 			FindName(nameof(StatusBar));
@@ -482,4 +487,4 @@ private void PaneSplitter_ManipulationStarted(object sender, ManipulationStarted
 				InputSystemCursorShape.SizeWestEast : InputSystemCursorShape.SizeNorthSouth));
 		}
 	}
-}
+}