Modify condition for fixedToRight and fixedToBottom

Source/core/page/scrolling/ScrollingCoordinator.cpp

Index: Source/core/page/scrolling/ScrollingCoordinator.cpp
diff --git a/Source/core/page/scrolling/ScrollingCoordinator.cpp b/Source/core/page/scrolling/ScrollingCoordinator.cpp
index c09c01c5755f87eab0487d5af1a31e37ae6fe59b..27eb579005c09f628fd261651462ae2af8b2042b 100644
--- a/Source/core/page/scrolling/ScrollingCoordinator.cpp
+++ b/Source/core/page/scrolling/ScrollingCoordinator.cpp
@@ -188,8 +188,8 @@ static WebLayerPositionConstraint computePositionConstraint(const RenderLayer* l
     do {
         if (layer->renderer()->style()->position() == FixedPosition) {
             const RenderObject* fixedPositionObject = layer->renderer();
-            bool fixedToRight = !fixedPositionObject->style()->right().isAuto();
-            bool fixedToBottom = !fixedPositionObject->style()->bottom().isAuto();
+            bool fixedToRight = !fixedPositionObject->style()->right().isAuto() && fixedPositionObject->style()->left().isAuto();
+            bool fixedToBottom = !fixedPositionObject->style()->bottom().isAuto() && fixedPositionObject->style()->top().isAuto();
             return WebLayerPositionConstraint::fixedPosition(fixedToRight, fixedToBottom);
         }