ID 221573 - Mac Pro edge of the viewer does not apply colour space correction

Problem summary
On a mac pro bin, the colour corrected viewer is not proportionate to the size of the screen.

Customer reported version

Reported by support 3.1v1

Customer reported platform
Mac OSX 10.11.1 
Late 2013 Mac Pro

Steps to reproduce

1) On a Mac Pro launch any 3.0 or 3.1 version of Mari

2) Load the default head project 

3) Zoom in so the face covers the whole screen.

4) Notice the right hand side of the viewer is not colour corrected

Fig 1) Mari 3.0v4

Fig 2) Mari 2.6v5

Reproduced by support
3.0v1 3.0v2, 3.0v3, 3.0v4RC1 & 3.1v1

Expected behaviour

For the colours to appear the same

Actual behaviour
A bold division was at the side of the viewer, where colour was and wasn't corrected