Fix drag-and-drop autoscrolling with --enable-pinch-virtual-viewport

Source/core/rendering/RenderBox.cpp

Index: Source/core/rendering/RenderBox.cpp
diff --git a/Source/core/rendering/RenderBox.cpp b/Source/core/rendering/RenderBox.cpp
index b754afafc1e32a275d56dd9bde21cf3e70306770..a6930a24d14f493f66fa0e4df28499c8dadea426 100644
--- a/Source/core/rendering/RenderBox.cpp
+++ b/Source/core/rendering/RenderBox.cpp
@@ -526,7 +526,9 @@ void RenderBox::scrollRectToVisible(const LayoutRect& rect, const ScrollAlignmen
             } else {
                 if (frame()->settings()->pinchVirtualViewportEnabled()) {
                     PinchViewport& pinchViewport = frame()->page()->frameHost().pinchViewport();
-                    LayoutRect r = ScrollAlignment::getRectToExpose(LayoutRect(pinchViewport.visibleRectInDocument()), rect, alignX, alignY);
+                    LayoutRect viewRect = intersection(
+                        LayoutRect(pinchViewport.visibleRectInDocument()), frameView->visibleContentRect());
+                    LayoutRect r = ScrollAlignment::getRectToExpose(viewRect, rect, alignX, alignY);
                     pinchViewport.scrollIntoView(r);
                 } else {
                     LayoutRect viewRect = frameView->visibleContentRect();