Autocomplete (Menu): Only traverse through .ui-menu-item elements for…

… paging. Fixes #6029 - Autocomplete: Custom item can be activated (and result in error) on PageUp/PageDown key click.

ui/jquery.ui.autocomplete.js

@@ -501,24 +501,25 @@ $.widget("ui.menu", {
 		if (this.hasScroll()) {
 			// TODO merge with no-scroll-else
 			if (!this.active || this.last()) {
-				this.activate(event, this.element.children(":first"));
+				this.activate(event, this.element.children(".ui-menu-item:first"));
 				return;
 			}
 			var base = this.active.offset().top,
 				height = this.element.height(),
-				result = this.element.children("li").filter(function() {
+				result = this.element.children(".ui-menu-item").filter(function() {
 					var close = $(this).offset().top - base - height + $(this).height();
 					// TODO improve approximation
 					return close < 10 && close > -10;
 				});
 
 			// TODO try to catch this earlier when scrollTop indicates the last page anyway
 			if (!result.length) {
-				result = this.element.children(":last");
+				result = this.element.children(".ui-menu-item:last");
 			}
 			this.activate(event, result);
 		} else {
-			this.activate(event, this.element.children(!this.active || this.last() ? ":first" : ":last"));
+			this.activate(event, this.element.children(".ui-menu-item")
+				.filter(!this.active || this.last() ? ":first" : ":last"));
 		}
 	},
 
@@ -527,25 +528,26 @@ $.widget("ui.menu", {
 		if (this.hasScroll()) {
 			// TODO merge with no-scroll-else
 			if (!this.active || this.first()) {
-				this.activate(event, this.element.children(":last"));
+				this.activate(event, this.element.children(".ui-menu-item:last"));
 				return;
 			}
 
 			var base = this.active.offset().top,
 				height = this.element.height();
-				result = this.element.children("li").filter(function() {
+				result = this.element.children(".ui-menu-item").filter(function() {
 					var close = $(this).offset().top - base + height - $(this).height();
 					// TODO improve approximation
 					return close < 10 && close > -10;
 				});
 
 			// TODO try to catch this earlier when scrollTop indicates the last page anyway
 			if (!result.length) {
-				result = this.element.children(":first");
+				result = this.element.children(".ui-menu-item:first");
 			}
 			this.activate(event, result);
 		} else {
-			this.activate(event, this.element.children(!this.active || this.first() ? ":last" : ":first"));
+			this.activate(event, this.element.children(".ui-menu-item")
+				.filter(!this.active || this.first() ? ":last" : ":first"));
 		}
 	},