[Octave-bug-tracker] [bug #49053] figure scaling issue with Qt 5 on macOS with Retina / HiDPI scaling

[John Swensen]

Follow-up Comment #85, bug #49053 (project octave):

I think the line width adjustment bug has two parts and one of those parts
should be part of this patch.

1) Is the line width scaled with HiDPI screens?
2) Is the line width sufficient, after HiDPI issues are fixed?

I think we should definitely scale the glLineWidth based on the HiDPI scale
factor as part of this changeset, as it is already fixing many other OpenGL
drawing issues that involve HiDPI, but also have a different bug that
discusses the correct value for the linewidth.

This fix involves changing line in opengl_renderer::set_linewidth (float w)

glLineWidth (w);

to

glLineWidth (w * display_info::screen_scale ());


As a side note, I am doing some experiments where I am moving windows back and
forth between a HiDPI screen and a non-HiDPI screen to figure out how to make
that scale factor change based on the window location (for QT only)

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