weird bug with `Russian-computer'?

[Paul Pogonyshev]

With the `Russian-computer' input method, S-/ combination produces a comma
(instead of a question mark with standard English.)  That is OK and the
way it should be.  However, when I start incremental search, the key works
as in English, while the rest of the keyboard keeps producing Russian
letters etc.

To reproduce:

$ emacs -Q

C-x RET C-\ russian-computer RET
S-/     (note the comma)
C-s S-/ (note the question mark!)

I have a few months old CVS snapshot here.

Paul