CQ: Fix TitleBarDragRegion

Author: XTorLukas

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

@@ -138,7 +138,11 @@ 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))]);
+
+			var x = AppLanguageHelper.FlowDirection == FlowDirection.LeftToRight ? 0 : (int)TabControl.DragArea.ActualWidth;
+			var width = (int)(TabControl.ActualWidth + TabControl.Margin.Left - TabControl.DragArea.ActualWidth);
+
+			source.SetRegionRects(NonClientRegionKind.Passthrough, [getScaledRect(this, new RectInt32(x, 0, width, height))]);
 			return height;
 		}