Small line at the bottom of 3D Widgets when widgets positions are set to x=0,y=0

If the user sets a widget to the position x=0,y=0 and then applies this as a widget component, there will be an artifact at the bottom of the widget that is the color of the widget that is in this position.

1. Open the editor
2. Create an Actor Blurprint
3. Create a new widget blueprint
4. Add an image to the designer tab
5. Make sure the position of the widget is set to x=0, y=0
6. Compile and save
7. Open up the Actor blueprint that was created
8. Add a Widget Component
9. Set the widget class to the new widget component
10. Add the Actor to the level
11. Play in Editor
12. Walk up to the 3D widget and notice that at the bottom of the widget there is a line

Expected: There would be no artifacts at the bottom of the widget
Result: There is an artifact at the bottom of 3D widgets when the widget clips with the top and/or left sides of the canvas panel

UE4.8.2 UMG Widget has border in 3d world