Don't inherit block style if text is inserted after paragraph selection.

Source/core/editing/DeleteSelectionCommand.cpp

 /*
  * Copyright (C) 2005 Apple Computer, Inc.  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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 357 matching lines @@
         document().updateLayoutIgnorePendingStylesheets();
         RenderObject *r = node->renderer();
         if (r && r->isTableCell() && toRenderTableCell(r)->contentHeight() <= 0) {
             Position firstEditablePosition = firstEditablePositionInNode(node.get());
             if (firstEditablePosition.isNotNull())
                 insertBlockPlaceholder(firstEditablePosition);
         }
         return;
     }
 
-    if (node == m_startBlock && !isEndOfBlock(VisiblePosition(firstPositionInNode(m_startBlock.get())).previous()))
-        m_needPlaceholder = true;
-    else if (node == m_endBlock && !isStartOfBlock(VisiblePosition(lastPositionInNode(m_startBlock.get())).next()))
-        m_needPlaceholder = true;
+    if (node == m_startBlock) {
+        VisiblePosition previous = VisiblePosition(firstPositionInNode(m_startBlock.get())).previous();
+        if (previous.isNotNull() && !isEndOfBlock(previous))
+            m_needPlaceholder = true;
+    }
+    if (node == m_endBlock) {
+        VisiblePosition next = VisiblePosition(lastPositionInNode(m_endBlock.get())).next();
+        if (next.isNotNull() && !isStartOfBlock(next))
+            m_needPlaceholder = true;
+    }
 
     // FIXME: Update the endpoints of the range being deleted.
     updatePositionForNodeRemoval(m_endingPosition, *node);
     updatePositionForNodeRemoval(m_leadingWhitespace, *node);
     updatePositionForNodeRemoval(m_trailingWhitespace, *node);
 
     CompositeEditCommand::removeNode(node, shouldAssumeContentIsAlwaysEditable);
 }
 
 static void updatePositionForTextRemoval(Node* node, int offset, int count, Position& position)
@@ skipping 459 matching lines @@
 
 // Normally deletion doesn't preserve the typing style that was present before it.  For example,
 // type a character, Bold, then delete the character and start typing.  The Bold typing style shouldn't
 // stick around.  Deletion should preserve a typing style that *it* sets, however.
 bool DeleteSelectionCommand::preservesTypingStyle() const
 {
     return m_typingStyle;
 }
 
 } // namespace WebCore