Draggable: Changed mouse's cancel option from ":input,button" to ":input" (button is redundant).

Author: scottgonzalez

ui/ui.draggable.js

@@ -265,7 +265,7 @@ $.extend($.ui.draggable, {
 	defaults: {
 		appendTo: "parent",
 		axis: false,
-		cancel: ":input,button",
+		cancel: ":input",
 		delay: 0,
 		distance: 1,
 		helper: "original"