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[Octave-bug-tracker] [bug #49756] Crash when panning an image to top of

From: Pantxo Diribarne
Subject: [Octave-bug-tracker] [bug #49756] Crash when panning an image to top of axes
Date: Wed, 24 Oct 2018 11:45:17 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Firefox/60.0

Follow-up Comment #6, bug #49756 (project octave):

After trying the crashing example again, I can see something wrong on linux
too: even though this doesn't lead to a crash, the clipping of the image is
wrong when I pan/drag the image.

FTR, the problematic example is:

close all
imx0 = 60;
imy0 = 70;
imxf = 442;
imyf = 452;
imxF = 9;
imyF = 3000;

The origin of the issue is that the opengl renderer assumes ydata(1) >
ydata(2) and it is a wrong assumption in this example. 

I don't know if ML allows ydata(1) < ydata(2) but I'd be tempted to disallow
that or silently invert those data. Thoughts?


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