Arrow only draws correctly in 2D when arrow is pointing up or down

[devindazzle]

When in 2D mode, the arrowheads for horizontal lines disappear because the two lines forming the arrow points in the Z direction.

[code-beans]

Thanks for reporting @devindazzle . I didn't consider the use case for 2d mode.Are you making a PR for this? Otherwise I will see when I can make time for this feature