bug#716: Bug in buffer-swap-text

[jasonr]

Quoting Stefan Monnier <monnier@iro.umontreal.ca>:

> >> > I can reliably get a crash without changing coding systems:
> >> > (progn
> >> >   (buffer-swap-text (generate-new-buffer "test"))
> >> >   (insert (make-string 128 ?a)))
> > I get a crash at this point using C-x C-e on this line as the first
> > activity in emacs -Q, after pasting the above into *scratch* and
> > removing the > quotations.
> > Can you reproduce it by evaluating the following first:
> > (set-default-coding-systems 'iso-latin-1-dos)
>
> No, that doesn't help.  I'm still not able to reproduce it.

Since the crashes seem to be happening when the swapped buffers are subsequently
displayed, how about trying different font backends, for example:
  emacs -Q -xrm Emacs.fontBackend:x

Not sure what font backend the user on NetBSD/powerpc was using, but there might
be something that the xft font backend does that buffer-swap-text is relying on
which the w32 and one of the x font backends are not doing correctly.