ID 221970 - BoundingBox displays incorrectly in Viewer Info bar if overscan is set above 0 in ScanlineRender

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Problem summary
the bounding box displays incorrectly in the Viewer when an overscan is applied in the node network. The following example is a 'HD_1080 1920x1080' format project with an overscan value of 20:

The viewer displays: (-20 -20 1940, 1100)

The viewer info bar displays: (-20 -20 1960 1120)

The viewer bounding box is displaying correctly, as it is including the 20 overscan, however the viewer info bar appears to be doubling the value of the overscan and applying this value to the top right values i.e. 1920 + 40 = 1960, 1080 + 40 = 1120   (the lower left corner displays correctly)

Customer reported version
nuke.9.0v8

Customer reported platform
windows7

Steps to reproduce

1. Open Nuke and ensure project settings are of format 1920x1080
2. Copy and paste the script in the comment below 
3. View the Write node
Result: Viewer info bar displays incorrect bbox value:
-20 -20 1960 1120
Whereas the Viewer bbox value is correct as it includes the default format and the overscan:
-20 -20 1940 1100
 
Reproduced by support
OSX 10.11.3: Nuke 10.0v2, Nuke8.0v6, Nuke9.0v1
Windows 8: Nuke 9.0v8

Expected behaviour
Bounding box to match for both viewer and viewer info bar

Actual behaviour
Bounding Box had a double overscan value applied to the top right values

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