Add "delete" checkbox to content filters on admin/content/node

On the admin/content/node page, at the top, there's a filter section:

Show only items where
          status is   [                   ]
          type is     [                   ]
          category is [                   ]
Update options

When you add a filter, you get something like:

Show only items where
    * Status is <published>
    * category is <reader>
      and where
          status is   [                   ]
          type is     [                   ]
          category is [                   ]
Update options

If you want to get rid of an option, you have to either undo the last one, or remove them all, then add a new one. This is always a two-step process.

It would be very useful to have a "delete this filter" check box after each existing filter:

Show only items where
    * Status is <published> [x] Delete?
    * category is <reader>  [ ] Delete?
      and where
          status is   [                   ]
          type is     [                   ]
          category is [                   ]
Update options

This would allow the admin to remove arbitrary filters, while adding new ones, basically making it a one-step process for all procedures.