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terminal: suppress warning in subterm
Empty format-strings are just fine if format-functions do more than printing. This is the case here, so suppress the "empty format-string" warning by using "%s" with an empty argument.
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@ -386,7 +386,7 @@ static void output_draw_frame(Output *o) {
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static void output_draw_menu(Output *o) {
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assert(o);
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output_frame_printl(o, "");
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output_frame_printl(o, "%s", "");
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output_frame_printl(o, " Menu: (the following keys are recognized)");
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output_frame_printl(o, " q: quit");
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output_frame_printl(o, " ^C: send ^C to the PTY");
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