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Adding torus re-orders UV layers
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Noticed this while looking into a related issue.

The following steps re-order the UV layers.

  • With the default Cube, add 2 UV layers.
  • Enter edit-mode
  • Add a Torus
  • Enable "Generate UVs"

Notice that before adding the torus the UV layers are UVMap, UVMap.001.
After adding the UVMap.001 becomes the first UV layer.

This looks to be caused by object join code.

Event Timeline

May I have a look?

Has managed to reproduce it.

When enabling Generate UVs the selected UVmap becomes first UV layer.
The change (UVMap.001 becomes the first UV layer.) happens not when adding torus but when enabling Generate UVs and only if the UVMap.001 is selected.

on Windows 8 Enterprise 32bits using with Intel HD graphics
Blender 2.78 (sub 4), branch: master, commit date: 2017-01-26 16:22, hash: 67bef6b, type: Release
build date: Fri 01/27/2017, 03:05 AM

Aaron Carlisle (Blendify) triaged this task as Normal priority.

@Valentin (ValentinRueda) feel free to take a look. No need to ask.