[Bf-funboard] Feature request: Fewer viewport updates when editing texture nodes

[Thor Ekle]

Hi everyone,

This is my first time requesting a feature, and this really is in the 
gray area between a bug and a feature, so I apologize if I've gone about 
this in the wrong way.

Issue:
When the 3D viewport is set to Rendered mode and you're editing textures 
in the node editor, the viewport updates unnecessarily. This disrupts 
the workflow somewhat and can probably be improved on fairly easily.

As far as I can tell, it should not be necessary to redraw the viewport 
when:

. A new node is added
. When a node where all the output sockets are empty is edited

I suppose it might be possible to trace through the node tree to 
determine if a redraw is required in response to any type of edit; this 
may catch more use cases than I suggested above.

Thanks,
Thor