Bug#711142: gnuplot-qt: zooming with the 'qt' and 'wxt' terminals yields blank contents

[Vincent Lefevre]

Control: forwarded https://sourceforge.net/p/gnuplot/bugs/1419/

To summarize: this bug 711142 is about blank contents in the
particular case of a zoom where the result should be a part of a
segment, while bug 711139 (and 711141) is about issues related to
-persist.

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Vincent Lefèvre <vincent at vinc17.net> - Web: <https://www.vinc17.net/>
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Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)