[Octave-bug-tracker] [bug #44840] Plotting with Qt or FLTK from remote system fails

[Michael Godfrey]

URL:
  <http://savannah.gnu.org/bugs/?44840>

                 Summary: Plotting with Qt or FLTK from remote system fails
                 Project: GNU Octave
            Submitted by: godfrey
            Submitted on: Wed 15 Apr 2015 04:11:09 AM GMT
                Category: Plotting with OpenGL
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Matlab Compatibility
                  Status: None
             Assigned to: None
         Originator Name: Godfrey
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.0.0-rc3
        Operating System: GNU/Linux

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Details:

It appears that this has not worked since FLTK was first
introduced. I tried 3.8.2 and the current 4.0.0-rc3. 

If you ssh to another machine (with X11Forwarding ON) and
type plot(1:200) the outtine Figure appears but no data are
plotted and the command hangs. Neither fltk nor Qt work.
Of course, gnuplot still "works." Over the same connection
the standard X11 programs (like xclock) work correctly, so the
problem is in Octave. And, Matlab, running on the same systems,
works, so this is also a Matlab incompatibility.

To reproduce this:

ssh -X remote-machine (X only needed if X11Forwarding is not on)
octave
plot(1:200)
======================
at this point an incomplete plot appears and Octave hangs.

I am surprised that this has not been rported already, but
I found no relevant bug report.




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