bug#20734: 25.0.50; "Args out of range" with help-window-select t

[Eli Zaretskii]

> From: Nicolas Richard <youngfrog@members.fsf.org>
> Date: Fri, 05 Jun 2015 11:33:46 +0200
> Cc: 20734@debbugs.gnu.org
> 
> Stefan Monnier <monnier@iro.umontreal.ca> writes:
> 
> >> We can however get a gdb backtrace (I put a breakpoint in Fsignal, but
> >> it breaks more often than needed, so I say "continue" a few times in
> >> order to get the following) :
> >
> > You can put a break point in maybe_call_debugger, which tends to work
> > better in this sense.
> 
> Thanks. Would the following make sense in etc/DEBUG ?
> 
> -`Fsignal' is a very useful place to put a breakpoint in.
> -All Lisp errors go through there.
> +`Fsignal' is a very useful place to put a breakpoint in.  All Lisp
> +errors go through there.  If you are only interested in errors that
> +would fire the debugger, breaking at `maybe_call_debugger' is useful.

This is good, thanks.