Emitted when the selection state of some of the items in @model changes.
Note that this signal does not specify the new selection state of the
items, they need to be queried manually. It is also not necessary for
a model to change the selection state of any of the items in the selection
model, though it would be rather useless to emit such a signal.
Emitted when the selection state of some of the items in @model changes.
Note that this signal does not specify the new selection state of the items, they need to be queried manually. It is also not necessary for a model to change the selection state of any of the items in the selection model, though it would be rather useless to emit such a signal.