bug#19924: 24.4; incremental search for octal character

[Drew Adams]

> > I don't have a recent dev build (since Oct. 2014),
> 
> ??  There are newer dev builds at
> 
>   https://sourceforge.net/projects/emacs-bin/files/snapshots/

Hi Dani,

Yes, thanks.  My bad - I wasn't clear.  I still use a build from
2014/10/20 because later builds break my use of thumbnail frames.

It's still in my TODO list to narrow down the problem and file a
proper bug report about the regression.  I don't see the problem
from emacs -Q plus just my thumbnail code - there must be
something else in my setup that is causing the problem.  Maybe
I'll get some time this weekend to look into it.