Span: remaining border pixels

[michalsustr]

When a span is rendered off screen, one pixel "line" remains on the side of the figure. This is probably intentional with one bound, but should not be with both:

vs

FYI @azerupi

[azerupi]

@michalsustr you can assign the issue to me, I will look into this.

[michalsustr]

Great, thank you!