[Octave-bug-tracker] [bug #44781] Qt (but not FLTK) figure draws empty axes before doing the actual plot

[Dan Sebald]

Follow-up Comment #3, bug #44781 (project octave):

I understand the timing/asynchronous issue, however some trial and error
doesn't agree with the update during long draws.  That is, I've run
plot([1:5000000]) several times, changing window size while the draw is taking
place and don't see any sort of refresh until the whole plot is complete. 
Granted, the plot will have the wrong size because of the slow draw, and then
refresh again very slowly.  It could be that both constructing the plot and
repainting it are very slow.

Is this signal/slot the one that controls this?

  connect (this, SIGNAL (asyncUpdate (void)),
           this, SLOT (updateContainer (void)));

It looks like asyncUpdate isn't emitted anywhere anymore.  No harm of course,
just extraneous.

Could someone point to where the core code is issuing the primitives to draw
on the Qt canvas?  The code in the libgui/graphics is easily searchable, but
the core isn't so searchable.

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