Jesse Duffield 51fb82d6bf Enforce single-item selection in various actions ...

We want to show an error when the user tries to invoke an action that expects only
a single item to be selected.

We're using the GetDisabledReason field to enforce this (as well as DisabledReason
on menu items).

I've created a ListControllerTrait to store some shared convenience functions for this.

2024-01-19 10:50:49 +11:00

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