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Add configuration option to control whether duplicate items are allowed in sets

Description

It is currently possible to add an items multiple times to a set. This is intentional and allows construction of sets with recurring items with different captions or other set placement-specific data.

While in theory this is a feature, in practice it has proven confusing to most users, who expect sets to bar duplicates.

We should add an option to prevent duplicates and make it default to bar them.

Environment

None

Assignee

Seth Seth

Reporter

Seth Seth

Labels

Components

Fix versions

Affects versions

Priority

Major
Configure