(isearch-edit-string): Save old point and

(isearch-edit-string): Save old point and
isearch-other-end to old-point and old-other-end before reading
the search string from minibuffer.  After exiting minibuffer set
point to old-other-end if point and the search direction is the
same as before reading the search string.
(isearch-del-char): Don't set isearch-yank-flag to t.  Put point
to isearch-other-end.  Instead of isearch-search-and-update call
three functions isearch-search, isearch-push-state and isearch-update.