bug#25851: 25.2; GTK warning when starting Emacs when desktop file has more than one frame

[N. Jackson]

At 09:26 +0300 on Saturday 2017-03-25, Eli Zaretskii wrote:

> Could be the result of double-buffering implemented on master.
> What was the date your previous master-derived version was
> built? If that was before January, it could be before
> double-buffering was pushed.  Try disabling that via
> initial-frame-alist in your .emacs and see if doing that helps.

Yes, I haven't built master for a while, almost certainly not
since January.

But no it is not obviously the double-buffering IIUC. I evaluated:

  (modify-frame-parameters nil '((inhibit-double-buffering . t)))

in each of the frames, but the flashing when switching between
them was not effected.

N.