Allow setNeedsLayout on positioned objects when no parent container

Source/core/layout/LayoutObject.cpp

Index: Source/core/layout/LayoutObject.cpp
diff --git a/Source/core/layout/LayoutObject.cpp b/Source/core/layout/LayoutObject.cpp
index f668620b095015648d489dd76352b72f812f59c8..17ffefc967760e2c9e060b61836ebdbe6e53d195 100644
--- a/Source/core/layout/LayoutObject.cpp
+++ b/Source/core/layout/LayoutObject.cpp
@@ -758,7 +758,7 @@ void LayoutObject::markContainerChainForLayout(bool scheduleRelayout, LayoutObje
         // Don't mark the outermost object of an unrooted subtree. That object will be
         // marked when the subtree is added to the document.
         LayoutObject* container = object->container();
-        if (!container && !object->isLayoutView())
+        if (!container && !(object->isLayoutView() || object->isPositioned()))
             return;
         if (!last->isTextOrSVGChild() && last->style()->hasOutOfFlowPosition()) {
             bool willSkipRelativelyPositionedInlines = !object->isLayoutBlock() || object->isAnonymousBlock();