Reset button on exposed form doesn't work after triggering "positive keyword" error

On a view with an exposed "search term" filter, if you enter two random characters and submit, you'll get the error message "You must include at least one positive keyword with 3 characters or more" (if you haven't changed the default Drupal install settings, that is). If you now hit the reset button, the error message & previous input remain, the only effect is "&op=Reset" is appended to the URL.

I've confirmed this on a fresh Drupal & Views (&Ctools) install, also tried Views 7.x-3.x-dev but the issue remains.