Draggable: Set containment size after helper size change

Author: velezh

Diff for: ui/widgets/draggable.js

@@ -208,15 +208,15 @@ $.widget( "ui.draggable", $.ui.mouse, {
 			this._adjustOffsetFromHelper( o.cursorAt );
 		}
 
-		//Set a containment if given in the options
-		this._setContainment();
-
 		//Trigger event + callbacks
 		if ( this._trigger( "start", event ) === false ) {
 			this._clear();
 			return false;
 		}
 
+		//Set a containment if given in the options
+		this._setContainment();
+
 		//Recache the helper size
 		this._cacheHelperProportions();