Re: dired: it is actually a marked file off the screen you will act on

[Richard Stallman]

    Try this: do dired on a large directory of lots of similarly named
    files.  Now mark one of the files with "m", and move it off the screen
    with a C-v. Now use ! (dired-do-shell-command) on the file under the
    cursor.  Note how easy it is to think that the file under the cursor
    is the one to be acted upon!

    Therefore some visual extra warning should appear when
    dired-do-shell-command will act on a marked file and not the one under
    the cursor.

It is a reasonable idea in principle.  Any suggestions for how
to show the distinction?