[two_dimensional_scrollables] Fix TreeView horizontal hit testing

packages/two_dimensional_scrollables/CHANGELOG.md

@@ -1,6 +1,7 @@
 ## NEXT
 
 * Updates minimum supported SDK version to Flutter 3.38/Dart 3.10.
+* Fixes hit testing for `TreeView` row content after horizontal scrolling.
 
 ## 0.5.2
 

packages/two_dimensional_scrollables/lib/src/tree_view/render_tree.dart

@@ -182,7 +182,7 @@ class RenderTreeViewport extends RenderTwoDimensionalViewport {
         row = childAfter(row);
         continue;
       }
-      final Rect rowRect = parentData.paintOffset! & Size(viewportDimension.width, row.size.height);
+      final Rect rowRect = parentData.paintOffset! & row.size;
       if (rowRect.contains(position)) {
         result.addWithPaintOffset(
           offset: parentData.paintOffset,

packages/two_dimensional_scrollables/test/tree_view/render_tree_test.dart

@@ -161,6 +161,57 @@ void main() {
       expect(log, <String>['First', 'Second', 'Third']);
     });
 
+    testWidgets('row children remain hittable after horizontal scrolling', (
+      WidgetTester tester,
+    ) async {
+      final horizontalController = ScrollController();
+      addTearDown(horizontalController.dispose);
+      final tappedSegments = <String>[];
+
+      await tester.pumpWidget(
+        MaterialApp(
+          home: Align(
+            alignment: Alignment.topLeft,
+            child: SizedBox(
+              width: 200,
+              height: 40,
+              child: TreeView<int>(
+                tree: <TreeViewNode<int>>[TreeViewNode<int>(0)],
+                horizontalDetails: ScrollableDetails.horizontal(controller: horizontalController),
+                indentation: TreeViewIndentationType.none,
+                treeNodeBuilder: (_, _, _) {
+                  return Row(
+                    mainAxisSize: MainAxisSize.min,
+                    children: <Widget>[
+                      GestureDetector(
+                        behavior: HitTestBehavior.opaque,
+                        onTap: () => tappedSegments.add('leading'),
+                        child: const SizedBox(width: 200, height: 40),
+                      ),
+                      GestureDetector(
+                        behavior: HitTestBehavior.opaque,
+                        onTap: () => tappedSegments.add('trailing'),
+                        child: const SizedBox(width: 50, height: 40),
+                      ),
+                    ],
+                  );
+                },
+                treeRowBuilder: (_) => const TreeRow(extent: FixedTreeRowExtent(40)),
+              ),
+            ),
+          ),
+        ),
+      );
+      await tester.pump();
+
+      horizontalController.jumpTo(50);
+      await tester.pump();
+      await tester.tapAt(const Offset(175, 20));
+      await tester.pump();
+
+      expect(tappedSegments, <String>['trailing']);
+    });
+
     testWidgets('mouse handling', (WidgetTester tester) async {
       var enterCounter = 0;
       var exitCounter = 0;