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

[martin rudalics <rudalics@gmx.at>]

 > 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