Don't add duplicated line box rects into focus ring rects

Source/core/layout/LayoutBlock.cpp

Index: Source/core/layout/LayoutBlock.cpp
diff --git a/Source/core/layout/LayoutBlock.cpp b/Source/core/layout/LayoutBlock.cpp
index 0a7b15c3386cf2a35d3001843b9cbf0154b30dbe..6aa189fc9eb98f54b55729fc7bac7f14d579b22c 100644
--- a/Source/core/layout/LayoutBlock.cpp
+++ b/Source/core/layout/LayoutBlock.cpp
@@ -3547,8 +3547,12 @@ void LayoutBlock::addFocusRingRects(Vector<LayoutRect>& rects, const LayoutPoint
         addChildFocusRingRects(rects, additionalOffset);
     }
 
-    if (inlineElementContinuation)
-        inlineElementContinuation->addFocusRingRects(rects, additionalOffset + (inlineElementContinuation->containingBlock()->location() - location()));
+    if (inlineElementContinuation) {
+        Vector<LayoutRect> inlineFocusRingRects;
+        // We need to give the LayoutInline a clean vector to let it add focus ring rects of line boxes.
+        inlineElementContinuation->addFocusRingRects(inlineFocusRingRects, additionalOffset + (inlineElementContinuation->containingBlock()->location() - location()));
+        rects.appendVector(inlineFocusRingRects);
+    }
 }
 
 void LayoutBlock::computeSelfHitTestRects(Vector<LayoutRect>& rects, const LayoutPoint& layerOffset) const