bug#22012: 25.1.50; gdb broken by (json-string-format "doesn't start with `\"'!")

[martin rudalics]

> There are null bytes after `{"width":"4","alignment":"-1",'.  So it's
> a small wonder that json.el chokes.

I see.  Thunderbird choked as well, but I did not investigate.

> IOW, this is not a problem with
> either json.el not gdb-mi.el, but a much more fundamental problem with
> low-level Emacs functions that insert text into a buffer.

Maybe related to the loaddefs.el case.  That one stroke again here a few
days ago on my Debian machine.

> When did you last update from the emacs-25 branch?

This happend on my patched version of master/trunk.  So if anything we
could conclude that we may have been injecting null bytes already before
cutting the release branch.

martin