[Glamour] deselect all in a list presentation

> Hello,
> Is it possible to deselect everything in a list when something happen in a browser ?
> I did not manage do find a way to properly do that.
> I know that to select a specific value, you can do something like:
>
>               transmit from: #aPort ; to: #amotherPort->#selection ; transformed: [... ].
>
> I noticed that some 'morphic' presentations does react the same way when specifying an entity not present in the displayValues:
> A multiple selection list will unselect everything if it does not find the entity (that's the trick I currently use).
> A single selection list will keep the current selection.
>
> Maybe it would be a good idea to have a specific object to specify (in the transformed block)  when we want to unselect. We should update the existing presentations code to deal with it ?
> (Maybe there is already a simple way ? :))
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