Extra lines are drawn that shouldn't be there

[olavolav]

To Reproduce:

>>> plot(xs=[1,1], ys=[0,1], lines=True, x_min=3, x_max=6)
┌────────────────────────────────────────────────────────────┐
│                    ▖                                       │ 1.0
│                    ▌                                       │ 
│                    ▌                                       │ 
│                    ▌                                       │ 
│                    ▌                                       │ 0.7
│                    ▌                                       │ 
│                    ▌                                       │ 
│                    ▌                                       │ 
│                    ▌                                       │ 0.5
│                    ▌                                       │ 
│                    ▌                                       │ 
│                    ▌                                       │ 
│                    ▌                                       │ 0.3
│                    ▌                                       │ 
│                    ▌                                       │ 
│                    ▌                                       │ 
│▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▌▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁│ 0.0
└────────────────────────────────────────────────────────────┘
 3                                                          6

Obviously there should not be anything drawn in this view.

Here, the correct line is drawn, but also weird other ones. In interactive mode this line appears once the real one is out of view.