Sortable: Fixed container change detection. Fixes #5159 - Remove and receive events on nested sortables.

(cherry picked from commit b9ef00f)

Conflicts:

	ui/jquery.ui.sortable.js

Author: Martin Hoch

ui/jquery.ui.sortable.js

@@ -1012,15 +1012,16 @@ $.widget("ui.sortable", $.ui.mouse, {
 
 		if(this.fromOutside && !noPropagation) delayedTriggers.push(function(event) { this._trigger("receive", event, this._uiHash(this.fromOutside)); });
 		if((this.fromOutside || this.domPosition.prev != this.currentItem.prev().not(".ui-sortable-helper")[0] || this.domPosition.parent != this.currentItem.parent()[0]) && !noPropagation) delayedTriggers.push(function(event) { this._trigger("update", event, this._uiHash()); }); //Trigger update callback if the DOM position has changed
-		if(!$.ui.contains(this.element[0], this.currentItem[0])) { //Node was moved out of the current element
-			if(!noPropagation) delayedTriggers.push(function(event) { this._trigger("remove", event, this._uiHash()); });
-			for (var i = this.containers.length - 1; i >= 0; i--){
-				if($.ui.contains(this.containers[i].element[0], this.currentItem[0]) && !noPropagation) {
-					delayedTriggers.push((function(c) { return function(event) { c._trigger("receive", event, this._uiHash(this)); };  }).call(this, this.containers[i]));
-					delayedTriggers.push((function(c) { return function(event) { c._trigger("update", event, this._uiHash(this));  }; }).call(this, this.containers[i]));
-				}
-			};
-		};
+
+		// Check if the items Container has Changed and trigger appropriate
+		// events.
+		if (this !== this.currentContainer) {
+			if(!noPropagation) {
+				delayedTriggers.push(function(event) { this._trigger("remove", event, this._uiHash()); });
+				delayedTriggers.push((function(c) { return function(event) { c._trigger("receive", event, this._uiHash(this)); };  }).call(this, this.currentContainer));
+				delayedTriggers.push((function(c) { return function(event) { c._trigger("update", event, this._uiHash(this));  }; }).call(this, this.currentContainer));
+			}
+		}
 
 		//Post events to containers
 		for (var i = this.containers.length - 1; i >= 0; i--){