Horizontal or vertical WPF Lines limited to 125,000 pixels?

Question

Are horizontal or vertical WPF Lines limited to 125,000 pixels? Looking at the following code the Green line displays correctly but the Red one does not display at all despi

Answer 1

It definitely draws past 150,000 pixels, It is a bit strange that the line is not seen in this case, because for example if you do this

or this

all works fine, There is probably a answer somewhere as to why, but good find as this would cause significant flicker if you were animating the value of X2.