[Octave-bug-tracker] [bug #44776] [Qt] Restore window button does not trigger a repaint event for its content

[anonymous]

Follow-up Comment #23, bug #44776 (project octave):

So I've found that there's a difference in behaviour with ./run-octave
--no-gui and ./run-octave on QT5. I can't quite reproduce your problem but
using the gui interface on QT5 for me means I do get the black screen (amongst
other bugs which I guess I need to report.)

I wonder if the issue you're facing is something to do with the
opengl_renderer in gl-render.cc - I wouldn't be surprised if there was
something in there that nvidia driver was barfing on. I am certain there are
some bugs in there - for example if you take a window and resize it down to
the smallest it can be and then, resize it up you'll get a complete mess.

Now, as I can't reproduce your problem I guess we need to think about how to
debug it on yours...

I'd take a look at gl-render.cc - you could start with adding qDebug () or
std::cout statements to each of the draw functions to see if they appear to be
being double called or chase them back up the call-stack.

I think it might be also worth looking at and wiring in:
http://doc.qt.io/qt-5/qopengldebuglogger.html#details

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