Autocomplete: Fix list traversal bug. Fixes #7269 - autocomplete: hol…

…ding down arrow keys in Firefox does not traverse list

Use keypress event for listening for arrow keys because Firefox
and Opera do not repeat keydown events for these keys.

ui/jquery.ui.autocomplete.js

@@ -53,24 +53,29 @@ $.widget( "ui.autocomplete", {
 			})
 			.bind( "keydown.autocomplete", function( event ) {
 				if ( self.options.disabled || self.element.attr( "readonly" ) ) {
+                    suppressKeyPress = true;
 					return;
 				}
 
 				suppressKeyPress = false;
 				var keyCode = $.ui.keyCode;
 				switch( event.keyCode ) {
 				case keyCode.PAGE_UP:
+                    suppressKeyPress = true;
 					self._move( "previousPage", event );
 					break;
 				case keyCode.PAGE_DOWN:
+                    suppressKeyPress = true;
 					self._move( "nextPage", event );
 					break;
 				case keyCode.UP:
+                    suppressKeyPress = true;
 					self._move( "previous", event );
 					// prevent moving cursor to beginning of text field in some browsers
 					event.preventDefault();
 					break;
 				case keyCode.DOWN:
+                    suppressKeyPress = true;
 					self._move( "next", event );
 					// prevent moving cursor to end of text field in some browsers
 					event.preventDefault();
@@ -112,7 +117,28 @@ $.widget( "ui.autocomplete", {
 				if ( suppressKeyPress ) {
 					suppressKeyPress = false;
 					event.preventDefault();
+                    return;
 				}
+
+				var keyCode = $.ui.keyCode;
+				switch( event.keyCode ) {
+				case keyCode.PAGE_UP:
+					self._move( "previousPage", event );
+					break;
+				case keyCode.PAGE_DOWN:
+					self._move( "nextPage", event );
+					break;
+				case keyCode.UP:
+					self._move( "previous", event );
+					// prevent moving cursor to beginning of text field in some browsers
+					event.preventDefault();
+					break;
+				case keyCode.DOWN:
+					self._move( "next", event );
+					// prevent moving cursor to end of text field in some browsers
+					event.preventDefault();
+					break;
+                }
 			})
 			.bind( "focus.autocomplete", function() {
 				if ( self.options.disabled ) {