PoC for hijacking RequestBringIntoView event

src/MaterialDesignThemes.Wpf/Internal/BringIntoViewHijackingVirtualizingStackPanel.cs

@@ -0,0 +1,19 @@
+
+namespace MaterialDesignThemes.Wpf.Internal;
+
+public class BringIntoViewHijackingVirtualizingStackPanel : VirtualizingStackPanel
+{
+    public BringIntoViewHijackingVirtualizingStackPanel()
+        => AddHandler(FrameworkElement.RequestBringIntoViewEvent, new RoutedEventHandler(OnRequestBringIntoView), false);
+
+    private void OnRequestBringIntoView(object sender, RoutedEventArgs e)
+    {
+        if (e.OriginalSource is FrameworkElement child && child != this)
+        {
+            e.Handled = true;
+            var point = child.TranslatePoint(new Point(), this);
+            var newTargetRect = new Rect(new Point(point.X + 52, point.Y), child.RenderSize);
+            BringIntoView(newTargetRect);
+        }
+    }
+}

src/MaterialDesignThemes.Wpf/Themes/MaterialDesignTheme.TabControl.xaml

@@ -1,6 +1,7 @@
 <ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                     xmlns:converters="clr-namespace:MaterialDesignThemes.Wpf.Converters"
+                    xmlns:internal="clr-namespace:MaterialDesignThemes.Wpf.Internal"
                     xmlns:wpf="clr-namespace:MaterialDesignThemes.Wpf">
 
   <ResourceDictionary.MergedDictionaries>
@@ -45,7 +46,7 @@
                                      Focusable="False"
                                      KeyboardNavigation.TabIndex="1"
                                      Rows="1" />
-            <VirtualizingStackPanel x:Name="HeaderPanel"
+            <internal:BringIntoViewHijackingVirtualizingStackPanel x:Name="HeaderPanel"
                                                 HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                                                 Margin="{Binding Path=(wpf:TabAssist.HeaderPanelMargin), RelativeSource={RelativeSource TemplatedParent}}"
                                                 VerticalAlignment="{TemplateBinding VerticalContentAlignment}"