Patch for proper re-setting of frame selection's typing style.

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 686 matching lines @@
                 // FIXME: We probably shouldn't remove m_endTableRow unless it's fully selected, even if it is empty.
                 // We'll need to start adjusting the selection endpoints during deletion to know whether or not m_endTableRow
                 // was fully selected here.
                 CompositeEditCommand::removeNode(m_endTableRow.get());
             }
         }
 }
 
 void DeleteSelectionCommand::calculateTypingStyleAfterDelete()
 {
-    if (!m_typingStyle)
+    // Clearing any previously set typing style and doing an early return.
+    if (!m_typingStyle) {
+        document().frame()->selection().clearTypingStyle();
         return;
+    }
 
     // Compute the difference between the style before the delete and the style now
     // after the delete has been done. Set this style on the frame, so other editing
     // commands being composed with this one will work, and also cache it on the command,
     // so the Frame::appliedEditing can set it after the whole composite command
     // has completed.
 
     // If we deleted into a blockquote, but are now no longer in a blockquote, use the alternate typing style
     if (m_deleteIntoBlockquoteStyle && !enclosingNodeOfType(m_endingPosition, isMailBlockquote, CanCrossEditingBoundary))
         m_typingStyle = m_deleteIntoBlockquoteStyle;
@@ skipping 131 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