Fix passing event argument when hiding the pagejump-selector menu

and fix keyboard event detection.

program/js/app.js

@@ -3495,7 +3495,7 @@ function rcube_webmail()
         // go to specified page
         var p = parseInt(this.value);
         if (p && p != ref.env.current_page && !ref.busy) {
-          ref.hide_menu('pagejump-selector');
+          ref.hide_menu('pagejump-selector', e);
           ref.list_page(p);
         }
       });
@@ -8262,8 +8262,7 @@ function rcube_webmail()
       this.focused_menu = null;
       this.menu_keyboard_active = false;
     }
-  }
-
+  };
 
   // position a menu element on the screen in relation to other object
   this.element_position = function(element, obj)

program/js/common.js

@@ -283,10 +283,13 @@ cancel: function(evt)
  */
 is_keyboard: function(e)
 {
-  return e && (
-      (e.type && String(e.type).match(/^key/)) // DOM3-compatible
-      || (!e.pageX && (e.pageY || 0) <= 0 && !e.clientX && (e.clientY || 0) <= 0) // others
-    );
+  if (!e)
+    return false;
+
+  if (e.type)
+    return !!e.type.match(/^key/); // DOM3-compatible
+
+  return !e.pageX && (e.pageY || 0) <= 0 && !e.clientX && (e.clientY || 0) <= 0;
 },
 
 /**