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Lights projection line in Viewport (line of height from lights dont turn off if linked inside group)
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System Information
Windows 7 or 10
Geforse GS 250 or Quadro FX 4xxx

Blender Version
2.77 or 2.76

Short description of error
Hello. I Can`t turn off lights height lines in Viewport then lights is linked to another scene inside group...

Exact steps for others to reproduce the error
Based on a (as simple as possible) attached .blend file with minimum amount of steps

Scene1 contains some light (engine lights for ex). I group all rocket and link it to scene 2. In scene 2 I have another lights.
In preferences I can turn off light heigh line by change alpha of light in Themes -> 3d -> lamps. But linked lights lines stay visible....



Event Timeline

Alexey (a1ex3d) added a project: BF Blender.
Alexey (a1ex3d) set Type to Bug.
Alexey (a1ex3d) added a subscriber: Alexey (a1ex3d).
Alexey (a1ex3d) created this task.
Alexey (a1ex3d) raised the priority of this task from to Needs Triage by Developer.

I'm afraid once the group is instanced, everything in the group is drawn with TH_SELECT (User Preferences > Themes > 3D View > Object Selected).
This is overriden for all duplis [see draw_dupli_objects()], so it's not just the lamps color.
So in your case you "loose" the possibility to set alpha=0 for the lamp...
Of course it would be possible to do some extra checks in draw_dupli_objects_color(), not sure if this is desired though... let others decide... :)

Hmmh... My scene looks like this... And I want to add more lights to another engines... May be it is possible to turn off this line in object properties? I dont know where this line can help me.... May be in future Blender developers add ability to turn it off ? Thanks...

This isn't a bug, (its a request for an option).