On 05/16/2016 08:53 AM, Eli Zaretskii wrote:
> we could reject GTK+ 3.20.4 and later for Emacs 25.1 at configure
> time.

On further investigation of the Gtk+ source, it appears that the Gtk+ 
change went in at release 3.20.3. Since it seems clear that Emacs has 
serious problems in 3.20.3 or later because of the call to 
xg_frame_resized, I installed the attached patch and am boldly closing 
the bug report. Quite possibly there is a better way to fix the bug but 
I hope this is good enough to get by.