Substitute ? in dired without surrounding whitespace (was: Minibuffer default values list)

[Juri Linkov]

> If nobody finds a problem in a few days, please install it.

Installed.  And I found a related problem (not caused by this change).

One of mailcap entries is

    display 'jpeg:%s'

that gets translated to the dired's file name placeholder as

    display 'jpeg:?'

but dired doesn't substitute it with a file name because ? is not
surrounded by whitespace.  This dired's limitation applies also
to manually typing such a command line, not only by selecting it
from a list of mailcap commands.

Does there exist a way to tell dired to substitute a file name placeholder
without surrounding whitespace?

-- 
Juri Linkov
http://www.jurta.org/emacs/