regexp I-search does not match in index

[Ralf Wildenhues]

Hello Texinfo people,

when I use info from CVS texinfo, the new regexp I-search seems to not
match within an index node any more.

Example: assume you have Autoconf 2.64 installed and its info file in
your info search path.  Typing
  info Autoconf "Environment Variable Index"
  ^Cs C

(i.e., starting an I-search for capital C) will move you to the next
node, although there are several words containing a C in the node I
started from.  This does not happen if I turn off regexp searching with
the "R" command before doing the search, and it does not happen with
older info commands that don't have regexp I-search.

Thanks for maintaining texinfo,
Ralf