Node wrangler add-on combining 2 shaders with ALT + Right Mouse Button do not update in viewport.
**System Information**
Win 7x64, Nvidia GTX 580
Broken: blender-2.77-b8892ca-win64
Working: blender-2.77a x64
Node wrangler add-on combining 2 shaders with ALT + Right Mouse Button do not update in viewport.
1. Create cycles material with 2 shaders
2. Combine with ALT + Right Mouse Button - viewport do not update