Blender Git Loki

Fix T54935: Particle group instances don't render when hidden in viewport

Seems to be only related on linked nature of particles.

This is caused by some conflicting optimization done for viewport, which
does not do particles re-calculation if they do not depend on time
(which is crucial for big layout scene grass fields) and particle render
setting switch which was relying on fact that render pipeline will do
particle update via time dependency.

Now we extent an old workaround for invisible objects, which now also
deals with particles in the same way as old dependency graph was dealing
with this: tag object data for update if there is particle system.

There shouldn't be any speed difference between old and new depsgraph,
since tagging was already needed and was happening.

In Blender 2.8 such things should be easier to deal with since the whole
depsgraph is to be evaluated for render engine anyway.