[Octave-bug-tracker] [bug #58408] closing gnuplot windows without "close" makes other toolkits unusable

[Markus Mützel]

Follow-up Comment #5, bug #58408 (project octave):

AFAIU, the windows that are created with the gnuplot toolkit are "out of
control" of Octave. There is no way of knowing how large they are or if they
are even closed.
E.g. create a handle to figures with the "qt" and with the "gnuplot" toolkit:

graphics_toolkit ("qt"); hf_qt = figure (1);
graphics_toolkit ("gnuplot"); hf_gnuplot = figure (2);


Now close both figures (using the mouse) and check if the handles are still
valid:

>> ishghandle (hf_qt)
ans = 0
>> ishghandle (hf_gnuplot)
ans = 1


Or another example:

graphics_toolkit ("gnuplot");
hf_gnuplot = figure (2);
line ();


A gnuplot figure with a line should appear on screen.
Now close the window with the mouse and issue the following commands:

figure (3);
hold on


The figure reappears *with the previous content*. As far as Octave knows, the
window was never closed.

I don't know if there is anything we can do about this.
The communication with gnuplot is basically one way only.

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