[Octave-bug-tracker] [bug #41819] Qt plotting toolkit anti-aliasing support lacking on some graphics cards

[Mike Miller]

Update of bug #41819 (project octave):

              Item Group:              Regression => Feature Request        
                  Status:               Need Info => Confirmed              
                 Summary: Plot function misdraws plots given  an 'x' in plot
fmt argument. => Qt plotting toolkit anti-aliasing support lacking on some
graphics cards

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Follow-up Comment #5:

I can confirm this here. This does indeed look like the bad anti-aliasing
behavior on certain video drivers. We first saw this issue with the FLTK
plotting backend, which was fixed with the patch that Jordi is referring to.
The new Qt plotting backend does not have the equivalent patch made to it yet,
and it appears to have the same effect for some of us.

As a workaround, you can use "graphics_toolkit fltk" until this is fixed for
the Qt backend. Note that the Qt toolkit is new, hence this is not a
regression, you simply need to use the FLTK toolkit that is the default in the
3.8 series.

I'm retitling this bug to more broadly describe the situation and solution
needed.

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