can't tell if one is searching with appended whitespace

[Dan Jacobson]

Gentlemen, looking in the minibuffer, how can you tell the difference between
I-search: bla
and
I-search: bla 
Therefore, something must be done about it.
Why, one could miss important stuff if one doesn't realize he is
carrying around an appended blank in his search string!
Perhaps do something with color, or a " $" appearing, or turn on
show-trailing-whitespace in the minibuffer by default.
(setq-default show-trailing-whitespace t in .emacs isn't good enough.)