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

Source/core/editing/InsertTextCommand.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 112 matching lines @@
     ASSERT(m_text.find('\n') == kNotFound);
 
     if (!endingSelection().isNonOrphanedCaretOrRange())
         return;
 
     // Delete the current selection.
     // FIXME: This delete operation blows away the typing style.
     if (endingSelection().isRange()) {
         if (performTrivialReplace(m_text, m_selectInsertedText))
             return;
+        bool endOfSelectionWasAtStartOfBlock = isStartOfBlock(endingSelection().visibleEnd());
         deleteSelection(false, true, false, false);
         // deleteSelection eventually makes a new endingSelection out of a Position. If that Position doesn't have
         // a renderer (e.g. it is on a <frameset> in the DOM), the VisibleSelection cannot be canonicalized to
         // anything other than NoSelection. The rest of this function requires a real endingSelection, so bail out.
         if (endingSelection().isNone())
             return;
+        if (endOfSelectionWasAtStartOfBlock) {
+            if (EditingStyle* typingStyle = document().frame()->selection().typingStyle())
+                typingStyle->removeBlockProperties();
+        }
     } else if (document().frame()->editor().isOverwriteModeEnabled()) {
         if (performOverwrite(m_text, m_selectInsertedText))
             return;
     }
 
     Position startPosition(endingSelection().start());
 
     Position placeholder;
     // We want to remove preserved newlines and brs that will collapse (and thus become unnecessary) when content
     // is inserted just before them.
@@ skipping 105 matching lines @@
                 splitTextNode(textNode, offset);
             insertNodeBefore(spanNode, textNode.release());
         }
     }
 
     // return the position following the new tab
     return lastPositionInNode(spanNode.get());
 }
 
 }