Merge 108109

Source/WebCore/rendering/RenderObjectChildList.cpp

 /*
  * Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 502 matching lines @@
                 generatedContentContainer = RenderObject::createObject(owner->document(), pseudoElementStyle);
                 ASSERT(styledObject->node()); // The styled object cannot be anonymous or else it could not have ':before' or ':after' pseudo elements.
                 generatedContentContainer->setNode(styledObject->node()); // This allows access to the generatingNode.
                 generatedContentContainer->setStyle(pseudoElementStyle);
                 if (!owner->isChildAllowed(generatedContentContainer, pseudoElementStyle)) {
                     // The generated content container is not allowed here -> abort.
                     generatedContentContainer->destroy();
                     renderer->destroy();
                     return;
                 }
-                owner->addChild(generatedContentContainer, insertBefore);
+
+                // When we don't have a first child and are part of a continuation chain,
+                // insertBefore is incorrectly set to zero above, which causes the :before
+                // child to end up at the end of continuation chain.
+                // See https://bugs.webkit.org/show_bug.cgi?id=78380.
+                if (!insertBefore && type == BEFORE && owner->virtualContinuation())
+                    owner->addChildIgnoringContinuation(generatedContentContainer, 0);
+                else
+                    owner->addChild(generatedContentContainer, insertBefore);
             }
             if (generatedContentContainer->isChildAllowed(renderer, pseudoElementStyle))
                 generatedContentContainer->addChild(renderer);
             else
                 renderer->destroy();
         }
     }
 }
 
 } // namespace WebCore