* vip.el (vip-escape-to-emacs, vip-prefix-arg-value,
vip-prefix-arg-com): Use unread-command-event instead of
unread-command-char; respect its new semantics.
* isearch-mode.el (isearch-update, isearch-unread): Same.
replaced by...
(isearch-gnu-emacs-events): non-nil if should expect events in the
style generated by GNU Emacs 19. Set if set-frame-height is
fboundp; this is true on any GNU Emacs 19, whether or not it was
compiled with multiple frame support.
(isearch-mode-map): Test isearch-gnu-emacs-events instead of
isearch-frames-exist to see if we should bind switch-frame events.
(isearch-update): Test isearch-gnu-emacs-events instead of
isearch-frames-exist to see if unread-command-char's quiescent
value is nil or -1.
