bug#23221: 25.0.92; Crash in redisplay during isearch

[Eli Zaretskii <eliz@gnu.org>]

> Cc: 23221@debbugs.gnu.org
> From: Andy Moreton <andrewjmoreton@gmail.com>
> Date: Tue, 5 Apr 2016 16:09:20 +0100
> 
> > Did you make local changes in the 25.0.92 sources?  The line numbers
> > in the backtrace make no sense; I tried both the stock 25.0.92 sources
> > and the current emacs-25 branch, and none matched.  What am I missing?
> 
> Strange. This was built from the emacs-25 branch without any local changes,
> at commit a05fb21d73d2ca84dd7e5e7ee931931048ecddba. The line numbers look to 
> match the backtrace here - what is mismatched for you ?

Ignore me: I must have done something wrong, because now the lines
make perfect sense.  Maybe I didn't really look at the latest branch,
but at the stock 25.0.92 tarball instead.

Anyway: it's an assertion violation, but I cannot say anything
intelligent about the reason, given the information you provided.
Emacs was in isearch, obviously (which seems to say that the articles
were already reloaded, and you invoked a search), but other than
that...