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workaround test failures in buildbot:
in some VMs readline thinks that the window size is zero. ignore it.
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@ -1408,7 +1408,8 @@ sig_handler window_resize(int sig)
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struct winsize window_size;
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if (ioctl(fileno(stdin), TIOCGWINSZ, &window_size) == 0)
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terminal_width= window_size.ws_col;
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if (window_size.ws_col > 0)
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terminal_width= window_size.ws_col;
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}
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#endif
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