Code Quality: Follow up fixes for the title bar drag region (#16595)

Co-authored-by: Yair <39923744+yaira2@users.noreply.github.com>

Author: XTorLukas

src/Files.App/UserControls/TabBar/TabBar.xaml.cs

@@ -358,15 +358,19 @@ private void TabViewItem_Loaded(object sender, RoutedEventArgs e)
 			}
 		}
 
-		private void DragAreaRectangle_Loaded(object sender, RoutedEventArgs e)
+		private async void DragAreaRectangle_Loaded(object sender, RoutedEventArgs e)
 		{
-			double scaleAdjustment = DragAreaRectangle.XamlRoot.RasterizationScale;
-			double titleBarInset = ((FilePropertiesHelpers.FlowDirectionSettingIsRightToLeft
+			if (HorizontalTabView.ActualWidth <= 0 && TabBarAddNewTabButton.Width <= 0)
+				await Task.Delay(100);
+
+			var titleBarInset = ((FilePropertiesHelpers.FlowDirectionSettingIsRightToLeft
 				? MainWindow.Instance.AppWindow.TitleBar.LeftInset
-				: MainWindow.Instance.AppWindow.TitleBar.RightInset) / scaleAdjustment) + 40;
+				: MainWindow.Instance.AppWindow.TitleBar.RightInset) / DragAreaRectangle.XamlRoot.RasterizationScale) + 40;
 
-			HorizontalTabView.Measure(new(HorizontalTabView.ActualWidth - TabBarAddNewTabButton.Width - titleBarInset, HorizontalTabView.ActualHeight));
-			RightPaddingColumn.Width = new(titleBarInset >= 0 ? titleBarInset : 0);
+			RightPaddingColumn.Width = new(titleBarInset > 40 ? titleBarInset : 138);
+			HorizontalTabView.Measure(new(
+				HorizontalTabView.ActualWidth - TabBarAddNewTabButton.Width - titleBarInset,
+				HorizontalTabView.ActualHeight));
 		}
 	}
 }

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

@@ -127,6 +127,7 @@ private void UserSettingsService_OnSettingChangedEvent(object? sender, SettingCh
 		private void HorizontalMultitaskingControl_Loaded(object sender, RoutedEventArgs e)
 		{
 			TabControl.DragArea.SizeChanged += (_, _) => MainWindow.Instance.RaiseSetTitleBarDragRegion(SetTitleBarDragRegion);
+			TabControl.SizeChanged += (_, _) => MainWindow.Instance.RaiseSetTitleBarDragRegion(SetTitleBarDragRegion);
 			if (ViewModel.MultitaskingControl is not TabBar)
 			{
 				ViewModel.MultitaskingControl = TabControl;