Improve spatial navigation on overlapping elements.

Source/core/page/FocusController.cpp

Index: Source/core/page/FocusController.cpp
diff --git a/Source/core/page/FocusController.cpp b/Source/core/page/FocusController.cpp
index c8f4a75056a9cf6df2eb42042e18e2a32750d25b..aa083b5815785588fb729980527d7ca5f403bc01 100644
--- a/Source/core/page/FocusController.cpp
+++ b/Source/core/page/FocusController.cpp
@@ -755,7 +755,8 @@ static void updateFocusCandidateIfNeeded(FocusType type, const FocusCandidate& c
     }
 
     LayoutRect intersectionRect = intersection(candidate.rect, closest.rect);
-    if (!intersectionRect.isEmpty() && !areElementsOnSameLine(closest, candidate)) {
+    if (!intersectionRect.isEmpty() && !areElementsOnSameLine(closest, candidate)
+        && intersectionRect == candidate.rect) {
         // If 2 nodes are intersecting, do hit test to find which node in on top.
         LayoutUnit x = intersectionRect.x() + intersectionRect.width() / 2;
         LayoutUnit y = intersectionRect.y() + intersectionRect.height() / 2;