It also works with libgtk2.0-0 2.21.0-1ubuntu1, which you can get from https://launchpad.net/ubuntu/+source/gtk+2.0/2.21.0-1ubuntu1 . So the client-side decoration patch in 2.21.0-1ubuntu2 is what broke this.
(Apparently Emacs isn’t the only application that broke: bug 491521, bug 584228.)
It also works with libgtk2.0-0 2.21.0-1ubuntu1, which you can get from https:/ /launchpad. net/ubuntu/ +source/ gtk+2.0/ 2.21.0- 1ubuntu1 . So the client-side decoration patch in 2.21.0-1ubuntu2 is what broke this.
(Apparently Emacs isn’t the only application that broke: bug 491521, bug 584228.)