ID 273700 - Two LiveRender updates are sent when render cam is moved while looking through it in the Viewer

Problem summary
When moving a camera during a live render and looking through a different one in the Viewer, one live render update is sent. When the camera is moved while looking through it in the Viewer, two updates are sent.

Steps to reproduce

1. Open a Live Render Monitor tab.

2. Open the attached scene and start a Live Render.

3. Move the camera while looking through the persp camera - one update is sent to the live render.

4. Look through the camera in the Viewer and move it - two updates are sent to the live render.

Reproduced by support
Katana 2.5v5 Windows 7 / RHEL 6.6

Expected behaviour
One update should be sent to the live render.

Actual behaviour
There are two updates sent to the live render.