Ticket #4798: 4798.patch

_source/plugins/dialog/plugin.js

@@ -328 +328 @@
                         }
                 }
 
+                // In Opera, 'keypress' is fired once prior to 'keydown' and once after it. (#4798)
                 function focusKeyPressHandler( evt )
                 {
-                        processed && evt.data.preventDefault();
+                        processed && evt.data.preventDefault(), processed = 0;
                 }
 
                 // Add the dialog keyboard handlers.