[Octave-bug-tracker] [bug #50483] legend hide fails for gnuplot since v4.0.3

[Rik]

Follow-up Comment #7, bug #50483 (project octave):

@Dan: I believe the reason to check visibility is for cases where an object is
plotted, labeled, but eventually hidden.  This test code shows how it works


graphics_toolkit gnuplot
h1 = plot (1:10);
hold on
h2 = plot (10:-1:1);
legend abc def
## At this point, both lines are visible and labeled
set (h2, 'visible', 'off')
## Now, only one line is visible, and the legend has been properly updated
set (h2, 'visible', 'on')
## Both lines are visible and the legend has both labels


While the code above works perfectly, there is a problem if the number of
objects drops to 0.  At that point the legend still contains an entry which is
a magenta line and the literal text "-".  Try this


graphics_toolkit gnuplot
h = plot (1:10);
legend abc
set (h, 'visible', 'off')


If it were easy to fix it would be nice to do so.


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