bug#7728: 24.0.50; GDB backtrace from abort

[Drew Adams]

> But I see that fit-frame uses save-window-excursion.  So it will call
> set-window-configuration after the form inside save-window-excursion
> is evaluated.
> 
> Can you see what window configuration is saved and restored there, and
> post that configuration here?

When I get some time I'll try to take a look.