Line breaks are lost when pasted into textarea text starting with a blank line set while textarea...

Source/WebCore/editing/markup.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009, 2010, 2011 Google Inc. All rights reserved.
  * Copyright (C) 2011 Igalia S.L.
  * Copyright (C) 2011 Motorola Mobility. 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
@@ skipping 31 matching lines @@
 #include "CSSValue.h"
 #include "CSSValueKeywords.h"
 #include "DeleteButtonController.h"
 #include "DocumentFragment.h"
 #include "DocumentType.h"
 #include "Editor.h"
 #include "Frame.h"
 #include "HTMLBodyElement.h"
 #include "HTMLElement.h"
 #include "HTMLNames.h"
+#include "HTMLTextFormControlElement.h"
 #include "KURL.h"
 #include "MarkupAccumulator.h"
 #include "Range.h"
 #include "RenderObject.h"
 #include "TextIterator.h"
 #include "VisibleSelection.h"
 #include "XMLNSNames.h"
 #include "htmlediting.h"
 #include "visible_units.h"
 #include <wtf/StdLibExtras.h>
@@ skipping 811 matching lines @@
     }
 
     // Break string into paragraphs. Extra line breaks turn into empty paragraphs.
     Node* blockNode = enclosingBlock(context->firstNode());
     Element* block = static_cast<Element*>(blockNode);
     bool useClonesOfEnclosingBlock = blockNode
         && blockNode->isElementNode()
         && !block->hasTagName(bodyTag)
         && !block->hasTagName(htmlTag)
         && block != editableRootForPosition(context->startPosition());
-    
+    bool useLineBreak = enclosingTextFormControl(context->startPosition());
+
     Vector<String> list;
     string.split('\n', true, list); // true gets us empty strings in the list
     size_t numLines = list.size();
     for (size_t i = 0; i < numLines; ++i) {
         const String& s = list[i];
 
         RefPtr<Element> element;
         if (s.isEmpty() && i + 1 == numLines) {
             // For last line, use the "magic BR" rather than a P.
             element = createBreakElement(document);
-            element->setAttribute(classAttr, AppleInterchangeNewline);            
+            element->setAttribute(classAttr, AppleInterchangeNewline);
+        } else if (useLineBreak) {
+            element = createBreakElement(document);
+            fillContainerFromString(fragment.get(), s);
         } else {
             if (useClonesOfEnclosingBlock)
                 element = block->cloneElementWithoutChildren();
             else
                 element = createDefaultParagraphElement(document);
             fillContainerFromString(element.get(), s);
         }
         fragment->appendChild(element.release(), ec);
         ASSERT(!ec);
     }
@@ skipping 75 matching lines @@
     StringBuilder markup;
     markup.append("<a href=\"");
     markup.append(url.string());
     markup.append("\">");
     appendCharactersReplacingEntities(markup, title.characters(), title.length(), EntityMaskInPCDATA);
     markup.append("</a>");
     return markup.toString();
 }
 
 }