Describes whether the currently selected component can be moved down. If the last component is selected, it can't be moved.
Describes whether the currently selected component can be moved up. If the first component is selected, it can't be moved.
Describes whether the currently selected component can be removed. If there's only one component in the layout, it can't be removed.
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Describes which actions are currently available. Depending on how many components exist and which one is selected, only some actions can be executed successfully.