bug#7468: 24.0.50; Isearch highlighting

[Chong Yidong]

Juri Linkov <juri@jurta.org> writes:

> This bug is not specific to an Isearch in Info.  You can get the same bug
> for a regexp Isearch in a normal buffer as:
>
> 1) Search for the regexp "foot[" (C-M-s foot[)
> 2) Remove the last "[" (<DEL>)
>
> There is no lazy highlighting too.
>
> I think this patch is a general fix for all these bug cases:

Looks good to me, could you commit it to the emacs-23 branch?  Thanks.