Mouse: Fixed #4146: Don't set the flag to prevent click events if mou…

…seup occurs on a diferent element than mousedown (was preventing the next click event from occuring).

ui/ui.core.js

@@ -484,7 +484,7 @@ $.ui.mouse = {
 
 		if (this._mouseStarted) {
 			this._mouseStarted = false;
-			this._preventClickEvent = true;
+			this._preventClickEvent = (event.target == this._mouseDownEvent.target);
 			this._mouseStop(event);
 		}