Comment 18 for bug 805870

This patch doesn't work for me (terminatorlib/window.py). I've changed lines 307-311 to:
            try:
                from gi.repository import GdkX11
                t = GdkX11.x11_get_server_time(self.get_window())
            except AttributeError:
                t = 0
            self.get_window().focus(t)

Now it works like a charm!
Terminator 1.90-1 on Debian