bug#25959: No stop button in gdb toolbar

[Eli Zaretskii]

> From: Glenn Morris <rgm@gnu.org>
> Date: Fri, 03 Mar 2017 17:35:06 -0500
> 
> Glenn Morris wrote:
> 
> > emacs -Q -f gdb
> > gdb -i=mi a.out RET
> >
> > Choose "Go" button in toolbar, program starts running, "Go" disappears.
> > Now there should be a "Stop" button, but there isn't.
> >
> > gdb-show-stop-p returns nil because gdb-running-threads-count is 0.
> >
> > It works in 24.3, and fails in 24.4 through to current master.
> 
> Reverting 2e78e6a fixes this for me, so I've cc'd the author of that change.

What version of GDB do you have?

FWIW, the "Stop" button does appear for me, so this could depend on
whether GDB and/or the target supports non-stop execution (mine
doesn't).  My GDB version is 7.12, for the record.

Anyway, I guess reverting only the first hunk of 2e78e6a suffices?