The mode param is optional and so far this hasn't been an issue (with find anyway).  I'm not sure which one of these you would specify if either those cases were true. Once find has determined if the line is visible or not it will scroll the line to the center of the display if it's covered by the modal bar at the top anyway so the modal bar hasn't been a problem with this -- i tried various cases when i wrote it and it just seemed to work as desired.  Not sure if you can get into this state with a menu -- those should dismiss when a command is executed.