bug#15200: isearch-other-meta-char and shift

[Stefan Monnier]

> Maybe the arg KEEP-PRED set-temporary-overlay-map
> can be used to decide whether to exit Isearch and
> apply the key sequence to global keymaps?

Of course:

   KEEP-PRED can also be a function of no arguments: if it returns
   non-nil then MAP stays active.

KEEP-PRED is run in pre-command-hook, so it can check this-command.


        Stefan