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Colin Watson reports that on pre-releases of Ubuntu 18.04, configure events which don't actually involve a change of window size show up annoyingly often. Our handling of configure events involves throwing away the backing Cairo surface, making a fresh blank one, and scheduling a top-level callback to get terminal.c to do a repaint and populate the new surface; so a draw event before that callback occurs causes the window contents to flicker off and on again, not to mention wasting a lot of time. The simplest solution is to spot spurious configures, and respond by not throwing away the previous Cairo surface in the first place.