A Boolean value that indicates whether the outline view retains and releases the objects returned from its data source.
- macOS 10.12+
When the value of this property is
true, the outline view retains and releases the objects returned to it from
data. When the value is
false, the outline view treats the objects as opaque items and assumes that the client has a retain on them. The default value is
true for applications linked on macOS 10.12 and later, and
false for applications linked on earlier versions of macOS. If you require the legacy behavior and your app links in macOS 10.12 or later, the value of this property must be explicitly set to
false in code, because it is not encoded in the nib. In general, this is required if the items themselves create a retain cycle.