#3367: Introduce range iterator API
-----------------------+----------------------------------------------------
 Reporter:  garry.yao  |       Owner:  fredck      
     Type:  Bug        |      Status:  new         
 Priority:  Normal     |   Milestone:  CKEditor 3.0
Component:  General    |     Version:              
 Keywords:  Confirmed  |  
-----------------------+----------------------------------------------------
 There're many cases when we need to traverse the range from the start
 boundary node to the end boundary node, it's archiveable by the following
 codes:
 {{{
 var boundaryNodes = range.getBoundaryNodes();
                 var firstNode = boundaryNodes.startNode;
                 var lastNode = boundaryNodes.endNode.getNextSourceNode(
 true );
 var node = firstNode.getNextSourceNode();
 while( node )
 {
         if ( node.getName() == 'span'  && currentNode.getAttribute(
 '_fck_bookmark' ) )
         {
                 node = node.getNextSourceNode();
                 continue;
         }
         // Processing logic...
         node = node.getNextSourceNode();
 }
 }}}
 It's cumbersome due to at least two reasons:
  1. The collapsed range problem reported at #3292;
  1. It make code DUP at every plugin for the same logic;
 It's necessary to introduce an API for this feature with  '''dom
 iterator''', which already holds a method for iterating over paragraphs.
 So after the API, other plugins should walking through the range as easy
 as using the iterator.

-- 
Ticket URL: <http://dev.fckeditor.net/ticket/3367>
FCKeditor <http://www.fckeditor.net/>
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