Most of my old saves depended on photon having deco, and besides that's the only way of having moving items with deco. :(
https://powdertoy.co.uk/Discussions/Thread/View.html?Thread=17105&PageNum=35#Message=272652
I know this is very bad to not have this feature and I was planning to play around with it but we have to face it :(
jacksonmj was talking about this just yesterday,saying there was a reason deco was removed from photon Here it is:
Deco is being removed from PHOT because it's confusing to have two colours for a photon - it might seem reasonable to expect that colouring a photon will make it behave differently (e.g. different refraction angle in glass), but changing deco colour does not affect behaviour in any way. Also because PHOT deco never worked properly anyway, it only coloured the centre pixel, not the glow.
i'm willing to bet when the update comes all saves made before the update wont have the decoration layer removed, instead you just wont be able to decorate PHOT any more. i could be wrong about this, but it's how updates that may break old saves are usually released. (maybe a mod could confirm/deny this)
you-know.. that may not be a bad idea.
Yes.
I suspect implementing that will be somewhat difficult.