gnuterm qt issue

[Clinton Winant]

Hello

This script


 graphics_toolkit("gnuplot")
 close all
 setenv("GNUTERM", "qt")
plot([0 1],[0 1]);

 returns the error

(gnuplot_qt:20247): IBUS-WARNING **: Unable to connect to ibus: Could not connect: Connection refused

after this plotting results are unpredictable

no error is returned if the setenv command is ommited (but cairo graphics are not available)

For these tests .octaverc has been renamed,

    G N U P L O T
    Version 5.0 patchlevel 3    last modified 2016-02-21

GNU Octave, version 4.0.0        ubuntu 16.04