Race condition seems to be fixed

[Jacob Dawid]

Hello maintainers,

I probably fixed the race condition a few minutes ago. What I did was to separate the workspace model from the view as a prerequisite in the GUI, then I added an octave_loop callback into octave's main_loop(), in the same way the octave_exit callback was added. Usually, this callback is null, so it won't be called when there hasn't been set a callback. I did a hg diff (I hade to modify toplev.h and toplev.cc) attached to this mail and kindly ask for confirmation that I can push this on the GUI branch, see the very bottom of this file.

Best regards,

Jacob

gui.diff
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