Adjusting the width of the NodeGraph affects the zoom

[bentoogood]

Should be more like cropping.

[johnhaddon]

This relates to #46 as they both require adjustments to the IECore::CameraController.

[johnhaddon]

Does this ticket also apply to the image and scene views in the viewer? They also scale rather than crop...

[thiasbxl]

As of Gaffer 0.89.0, adjusting the size of the node graph also moves the center of the focus. This result in the graph suddenly focusing in a slightly different area, as if it was snapping to some sort of grid. Note sure why that is but I suspect there is something not quite working with this ticket. I think the previous behavior was less disrupting than this new one, would be great if this could be fixed.
To repro :
pan AND adjust the zoom in the graph, only then resize the graph and you'll see the graph focus center snappingto a different location.

Thx
-M

[johnhaddon]

Sorry about that Mathias - I made a noddy error in the crop calculation, and failed to spot it in my testing. This Cortex pull request should fix the issue :

ImageEngine/cortex#218