isearch scrolling

[Eli Barzilay]

The `isearch-allow-scroll' feature changes modifiers of keys that are
used to exit isearch.  In particular, this gets in the way of using
CUA-mode -- for example, isearch for something and use C-S-left -- no
selection is done.

The problem is in "isearch.el":

          ;; Handle a scrolling function.
          ((and isearch-allow-scroll
                (progn (setq key (isearch-reread-key-sequence-naturally 
keylist))
  HERE --->            (setq keylist (listify-key-sequence key))
                       (setq main-event (aref key 0))
                       (setq scroll-command (isearch-lookup-scroll-key key))))
           ...)

You can put messages before and after that line that show the current
key, and you'll see that a shift modifier is removed.  Commenting this
line out makes things work fine again.  I believe that this is a
correct fix: I don't see any use of keylist in the code, except for:

          (search-exit-option
           (let (window)
             (isearch-unread-key-sequence keylist)
             ...

and that's clearly the source of the problem (grab the previous value
of keylist, and use it in the above fragement, and things work again).

-- 
          ((lambda (x) (x x)) (lambda (x) (x x)))          Eli Barzilay:
                  http://www.barzilay.org/                 Maze is Life!