Fix/remove useless keyup event handler on username input in logon form (#6970)

CHANGELOG

@@ -15,6 +15,7 @@ CHANGELOG Roundcube Webmail
 - Fix bug where Ctype extension wasn't required in Installer and INSTALL file (#7049)
 - Fix so install-jsdeps.sh removes Bootstrap's sourceMappingURL (#7035)
 - Fix so use of Ctrl+A does not scroll the list (#7020)
+- Fix/remove useless keyup event handler on username input in logon form (#6970)
 
 RELEASE 1.4.1
 -------------

program/js/app.js

@@ -624,8 +624,6 @@ function rcube_webmail()
             input_user = $('#rcmloginuser'),
             input_tz = $('#rcmlogintz');
 
-        input_user.keyup(function(e) { return ref.login_user_keyup(e); });
-
         if (input_user.val() == '')
           input_user.focus();
         else
@@ -4486,26 +4484,6 @@ function rcube_webmail()
   };
 
 
-  /*********************************************************/
-  /*********           login form methods          *********/
-  /*********************************************************/
-
-  // handler for keyboard events on the _user field
-  this.login_user_keyup = function(e)
-  {
-    var key = rcube_event.get_keycode(e),
-      passwd = $('#rcmloginpwd');
-
-    // enter
-    if (key == 13 && passwd.length && !passwd.val()) {
-      passwd.focus();
-      return rcube_event.cancel(e);
-    }
-
-    return true;
-  };
-
-
   /*********************************************************/
   /*********        message compose methods        *********/
   /*********************************************************/