ID 161929 - Particles simulate needlessly, when viewing nodes which do not require particles

A script with a particle emitter tends to simulate particles even when
that simulation is not required to view the current node.

This can take an extremely long time, depending on the particle network
and the time scales involved.

Customer reported version
Nuke 8.0v6 & 9.0v5 
 

Customer reported platform

Mac/Windows/linux Fedora 19

Steps to reproduce

1) Open Script, setup a particle system ( e.g create a ParticleEmitter, attach it to a Camera, Scene, ScanlineRender )

2) Setup a few keframes with the ParticleEmitter

3) Create another particle setup

4) Modify the new ParticleEmitter over a few frames.

Result:  Sometimes, the original ParticleEmitter will start to simulate, when the Viewer is not connected to the node.

Workaround
Unknown.

Reproduced by support

Nuke 12.2v3 - Windows 10

Nuke 12.2v1 - Windows 10

Nuke 12.1v1 - Windows 10

Nuke 12.0v1 - Windows 10

Nuke 11.1v1 - Windows 10

Nuke10.0v6  - Windows 7

Nuke 8.0v6 & 9.0v5 OS, Mac/Windows/linux Fedora 19
Nuke 7.0v1 & 9.0v6 MacOS 10.10.2

Earliest version tested
- This issue appears to be in all versions of the product
 

Expected behavior

Particles should only re-simulate when visible within the Viewer 

Actual behavior
Sometimes the ParticleEmitter will re-simulate when not viewed, causing unneeded wait times.