I searched in google, it seems <wb:on-bind> is executed  when an existing repeater row is updated or after inserting a new row, is it right?
 if it is, let's say it is invoked by updating an existing row, does this mean an new row object is created and the old one is discarded? 
 
<wb:class id="widgets-class">
    <wb:temp-repeater id="widgets"     parent-path="wd:widgets"    row-path="*" row-path-insert="."     virtual-rows="true">
      <wb:on-bind>
        <wb:new id="widget-row-class"/>
      </wb:on-bind>
    </wb:temp-repeater>
  </wb:class>

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