Unexpected merging of vertex groups with different names #53206

System Information
Win 7 64 bit

Blender Version
Broken: 2.79

Short description of error
Mesh called Array is using array modifier with start cap option, all vertices of it belong to "Mask" vgroup. Some vertices of Start Cap mesh belong to "Bevel" vgroup.

When I choose "Bevel" group in Bevel modifier, vertices that are not in this group somehow merging with "Mask" group of Array mesh.

Exact steps for others to reproduce the error
Open file, choose "Bevel" vgroup in Bevel modifier -> see how another mesh is masking

PS. Workaround is to create another empty vgroup in the Start cap mesh and place it before "Bevel" group
Vgroup.blend

Changed status to: 'Open'

Added subscriber: @SergeL

Added subscriber: @zeauro

It looks like array modifier is not using name but index of vertex group.

It is interesting to be able to apply an effect depending of vertex group on cap and array after array modifier.
But yes ! Vertex groups with different names should not be merged.
Or, at least user should be warned.

Added subscriber: @Foaly

I have added a patch, but I don't know if I did it correctly.
If you can see it: Is it okay to fix it that way?

This issue was referenced by d9d3ed16a8

Changed status from 'Open' to: 'Resolved'

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Unexpected merging of vertex groups with different names #53206