Steps to reproduce:
1. Download and open the attached project
2. Open the scene view
3. Move the Quad along any axis

Expected result: quad changes color depending on screen position
Actual result: quad barely changes color unless the shader's .xyz component divided by its .w.

Reproduced on 5.4.2f2, 5.4.3p3, 5.5.0p2, 5.6.0b2
Shader breaks on earlier versions

Notes:
-This can be fixed when the shader's .xyz component divided by its .w. In this project this can be done by setting the "Divide by W" value to 1 in the Quad's shader
-This is not necessarily a bug, but should be noted in the documentation