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Drag and Drop Release Notes

0.12.0

   * The logic to determine if a drag should be initiated has been isolated
     to the clickValidator method.  This method can be overridden to provide
     custom valdiation logic.  For example, it is possible to specify hotspots
     of any dimension or shape.  The provided example shows how to make only
     a circular region in the middle of the element initiate a drag.

   * Added a new drag and drop event: onInvalidDrop.  This is executed when
     the dragged element in dropped in a location without a target.  Previously
     this condition could only detected by implementing handlers for three 
     other events.

   * Now accepts an element reference in lieu of an id.  Ids will
     be generated if the element does not have one.

   * Fixed horizontal autoscroll when scrollTop is zero.

   * Added hasOuterHandles property to bypass the isOverTarget check in the
     mousedown validation routine.  Fixes setOuterHandleElId.

0.11.4

   * YAHOO.util.DragDropMgr.swapNode now handles adjacent nodes properly
   
   * Fixed missing variable declarations

0.11.3
 
   * Fixed a JavaScript error that would be generated when trying to implement
     DDProxy using the default settings and a tiny element.

   * Fixed an error that resulted when constraints were applied to DragDrop 
     instances.

0.11.2

   * Drag and drop will no longer interfere with selecting text on elements
     that are not involved in drag and drop.

   * The shared drag and drop proxy element now resizes correctly when autoResize
     is enabled.

0.11.1

   * Fixes an issue where the setXY cache could get out of sync if the element's
     offsetParent is changed during onDragDrop.

0.11.0

   * The Dom.util.setXY calculation for the initial placement of the dragged
     element is cached during the drag, enhancing the drag performance.

   * DDProxy no longer enforces having a single proxy element for all instances.
     dragElId can be set in the config object in the constructor.  If the
     element already exists it will use that element, otherwise a new one will
     be created with that id.

   * DDProxy->borderWidth has been removed. The value is calculated on the fly
     instead.

   * Added DragDrop->clearTicks and DragDrop->clearConstraints

   * All drag and drop constructors now have an additional, optional parameter
     call "config".  It is an object that can contain properties for a
     number of configuration settings.

   * Drag and drop will not be disabled for elements that cannot have their
     location determined.

   * isLegalTarget won't return dd objects that are not targetable.

   * Added DragDrop->removeFromGroup.

   * Constraints are now applied properly when determining which drag and drop
     events should fire.


0.10.0

   * Improved the performance when in intersect mode

   * It was possible for the drag and drop initialization to be skipped
     for very slow loading pages.  This was fixed.

   * New methods to exclude regions within your drag and drop element: 
     addInvalidHandleId(), addInvalidHandleClass()

   * Added an onAvailable handler that is executed after the initial state is set.

   * Drag and drop is more forgiving when the implementer attempts to create the
     instance prior to the element being in the document, but after the window
     load event has fired.