[Octave-bug-tracker] [bug #44916] Printing Qt-drawn figures produces faulty files

[Michael Godfrey]

Follow-up Comment #52, bug #44916 (project octave):

John,

I am building with current FC21 which appears to be
qt5. rpm -qa|grep qt<3,4,5>
shows only qt5 and:
qt3-3.3.8b-63.fc21.x86_64
which apparently is needed by some other package.

You said:
>So on some systems the Qt graphics window hangs when connecting >with ssh but
we have no clue why or how to avoid that problem? >But the fltk widget works?

Yes, fltk works completely as long as print is only done
with visible off.  I do think that it is a good idea to only
run the print code with visible off in any case. This is
more efficient, allows use when visible on would not work,
and avoids distracting flicker on the screen. So, I would
advocate pushing a patch for that separate from trying to
fix qt.

>From what I see, there is something basically wrong in the
qt code. The fact that randomly incomplete plots show up
when running qt through ssh suggests that there is a
race condition/timing problem at least.

Anything else I can provide?



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