Droppable: Make sure._drop is called for all relevant droppables. Fix…

…es #6009 - Upper droppable should receive draggable. Fixes #6085 - Parent droppable takes precedence over dynamically created child droppable.

(cherry picked from commit fdc332e)

ui/jquery.ui.droppable.js

@@ -227,7 +227,7 @@ $.ui.ddmanager = {
 
 			if(!this.options) return;
 			if (!this.options.disabled && this.visible && $.ui.intersect(draggable, this, this.options.tolerance))
-				dropped = dropped || this._drop.call(this, event);
+				dropped = this._drop.call(this, event) || dropped;
 
 			if (!this.options.disabled && this.visible && this.accept.call(this.element[0],(draggable.currentItem || draggable.element))) {
 				this.isout = 1; this.isover = 0;