MMB rewiring uses Bubble + handledEventsToo to observe press

The Tunnel-phase subscription on PointerPressed was silently never firing for
middle-clicks on metadata rows — ProDataGrid's row-level pointer handlers
appear to claim the event before our tunnel subscription gets a turn, so
MMB-on-a-row went nowhere despite the unit tests (which call RaiseRowActivated
directly) staying green. Switching to Bubble + handledEventsToo: true gives
us a guaranteed seat regardless of who marked the event handled along the way.
Both the assembly-tree and the metadata-grid MMB handlers move together for
consistency.

Assisted-by: Claude:claude-opus-4-7:Claude Code

ILSpy/AssemblyTree/AssemblyListPane.axaml.cs

@@ -50,10 +50,12 @@ namespace ILSpy.AssemblyTree
 			InitializeComponent();
 			TreeGrid.DoubleTapped += OnTreeGridDoubleTapped;
 			TreeGrid.KeyDown += OnTreeGridKeyDown;
-			// Tunnelling subscription so the MMB is observed before the DataGrid's own
-			// pointer handling claims it.
+			// Bubble + handledEventsToo: ProDataGrid's row-level pointer handlers mark
+			// PointerPressed handled before bubble reaches our subscription, so we have to
+			// opt into "see handled events too" to react.
 			TreeGrid.AddHandler(PointerPressedEvent, OnTreeGridPointerPressed,
-				global::Avalonia.Interactivity.RoutingStrategies.Tunnel);
+				global::Avalonia.Interactivity.RoutingStrategies.Bubble,
+				handledEventsToo: true);
 
 			// Context-menu host. Tests bypass this and re-attach via AttachContextMenu so they
 			// can inject stub entries — at app-runtime we resolve the registry through the

ILSpy/Views/MetadataTablePage.axaml.cs

@@ -61,10 +61,14 @@ namespace ILSpy.Views
 			if (grid is not null)
 			{
 				grid.DoubleTapped += OnGridDoubleTapped;
-				// Subscribe at the tunnelling phase so the middle-click is observed before
-				// the DataGrid's own selection / scroll handling can swallow it.
+				// Bubble + handledEventsToo: ProDataGrid's row-level pointer handlers mark
+				// PointerPressed handled before bubble reaches our subscription, so we have to
+				// opt into "see handled events too" to react. Tunnel was tried first but
+				// ProDataGrid's hierarchy seemingly intercepts the tunnel pass for non-primary
+				// buttons — bubble + handledEventsToo is the reliable path.
 				grid.AddHandler(PointerPressedEvent, OnGridPointerPressed,
-					global::Avalonia.Interactivity.RoutingStrategies.Tunnel);
+					global::Avalonia.Interactivity.RoutingStrategies.Bubble,
+					handledEventsToo: true);
 			}
 		}