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Duplicate active color attribute
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Description

This task is part of the community & sub tasks of the workboard. Anyone is free to pick up this task and contribute. For any questions or needed reviewers, please tag @Joseph Eagar (joeedh) and @Julien Kaspar (JulienKaspar) or use blender.chat.

The behaviour in past releases of Vertex Color is when creating a new layer in the list, it will be a duplicate of the previously active vertex color layer.
In the latest master and for the 3.2 release this is no longer possible because of D12587. Each time a new color attribute is created, it is blank instead of a copy.

This is still possible to achieve by using geometry nodes, but that can be considered a workaround.

While the current behaviour when creating a new color attribute should stay as it is, there needs to be an additional option in the color attribute tab of the properties editor to duplicate the active color attribute.