bug#21208: 25.0.50; isearch gets confused with 'too many words'

[Sebastien Vauban <sva-news-D0wtAvR13HarG/iDocfnWg@public.gmane.org>]

Dima Kogan <dima-8Bn8oVo35dduSJGsrdOfxA@public.gmane.org> writes:
> Hi. I'm running a very recent build of emacs from git:
>
>   https://github.com/emacs-mirror/emacs/commit/0aec2aaccd8b745fa7214f3edd453c04a04bfba4
>
> I just found another isearch regression. Recipe:
>
> 1. emacs -Q
>
> 2. Create or open file such that the buffer contains
> -------------------------
> 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234
> 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234
> 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234
> 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234
> 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234
> 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234
> 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234
> 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234
> 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234
> 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234
>
> 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234
> 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234
> 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234
> 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234
> 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234
> 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234
> 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234
> 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234
> 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234
> 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234 1234
> -------------------------
> i.e two identical long lines containing lots of words '1234'.
>
> 3. Point to start of buffer
>
> 4. C-s
>
> 5. C-w multiple times. As you press C-w, you grow the string being
> sought; you can see the match highlighted on the line being selected and
> on the next line
>
> 4. Eventually (column 239 or so) the minibuffer says 'too many words',
> and the search no longer matches anything on either line. The sought
> string looks like it's appending words without spaces ("123412341234"
> instead of "1234 1234 1234"). Manually fixing that with M-e doesn't
> appear to help.

Confirmed -- was about to report it as well!

Best regards,
  Seb