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NmtMacEntry would allow you to input 1 character more than it should have. Fix that. Also, the code to insert ":"s automatically was bumping against some weirdness in NmtNewtEntry that made it so that the ":" didn't get displayed until you typed one more character after the one where it got inserted. Hack around that by manually requesting a redraw. https://bugzilla.gnome.org/show_bug.cgi?id=731160
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