ID 266756 - Live Rendering send updates when the render is paused

Problem summary:

If you choose to pause the render process via the Render > 3D Rendering > Pause Render menu option during a live render, this does not have any impact on the live rendering subsystem, which continues to attempt to send data and control messages to the paused process. This can result in Katana freezing.

It appears to be a Linux only issue but Windows also has incorrect behaviour.

On Windows, the process is closed when the user presses Pause, but when they un-pause it does not start until you restart the Live Render. 

Steps to reproduce:

1. Open a scene
2. Start a live render
3. Select the Render > 3D Rendering > Pause Render menu option
4. Continue manipulating the scene.

Expected behaviour:

No live updates should be sent to the render plug-in, everything should continue again when the process is resumed.

Actual behaviour:

Live updates are still sent to the render plug-in and sometimes the process will hang.

Workaround:

No known workaround.

Reproduced versions/platforms: