For example, re-ordering panelGroups that are both draggable and a dropTarget within a dataTable results in additional markup being added to the DOM update. The DOM update that occurs as a result of this drag and drop includes references to Droppables.add, which is a javascript call used by addDropTarget() (com.icesoft.faces.context.effects.DragDrop.java) to make an HTML element droppable. Here is one such update as logged by Firebug:

<updates><update address="statcomForm:stringTable:5:id" tag="span"><attribute name="class"><![CDATA[iceOutTxt]]></attribute><attribute name="id"><![CDATA[statcomForm:stringTable:5:id]]></attribute><attribute name="style"><![CDATA[float:left;font-weight:bold;]]></attribute><content><![CDATA[String1_8]]></content></update><update address="statcomForm:stringTable:8:id" tag="span"><attribute name="class"><![CDATA[iceOutTxt]]></attribute><attribute name="id"><![CDATA[statcomForm:stringTable:8:id]]></attribute><attribute name="style"><![CDATA[float:left;font-weight:bold;]]></attribute><content><![CDATA[String1_2]]></content></update><update address="Bg4a5OHjo38unau3UK1-QA:1:dynamic-code" tag="script"><attribute name="id"><![CDATA[Bg4a5OHjo38unau3UK1-QA:1:dynamic-code]]></attribute><attribute name="type"><![CDATA[text/javascript]]></attribute><content><![CDATA[Droppables.add('statcomForm:stringTable:0:j_id17',{mask:'1,2,3,4,5'});Droppables.add('statcomForm:stringTable:1:j_id17',{mask:'1,2,3,4,5'});Droppables.add('statcomForm:stringTable:2:j_id17',{mask:'1,2,3,4,5'});Droppables.add('statcomForm:stringTable:3:j_id17',{mask:'1,2,3,4,5'});Droppables.add('statcomForm:stringTable:4:j_id17',{mask:'1,2,3,4,5'});Droppables.add('statcomForm:stringTable:5:j_id17',{mask:'1,2,3,4,5'});Droppables.add('statcomForm:stringTable:6:j_id17',{mask:'1,2,3,4,5'});Droppables.add('statcomForm:stringTable:7:j_id17',{mask:'1,2,3,4,5'});Droppables.add('statcomForm:stringTable:8:j_id17',{mask:'1,2,3,4,5'});Droppables.add('statcomForm:stringTable:9:j_id17',{mask:'1,2,3,4,5'});Ice.Focus.setFocus('undefined');//261087250]]></content></update></updates>

It has been recommended that we review optimizing these drag and drop DOM updates and remove markup such as Droppables.add().

A test case (intended for deployment on tomcat 6) containing 3 sample pages is attached.

1. http://localhost:8080/sc8858/dnd_demo1.iface
2. http://localhost:8080/sc8858/dnd_demo2.iface
3. http://localhost:8080/sc8858/dnd_demo2_no_dnd.xhtml

Pages' 1 and 2 are very much the same and can be used to reproduce the extra markup included in the send-receive-updates-request. The third page does not exhibit the issue as dropTarget is set to false which means that we do not keep track of droppable elements.