Allows the delegate to specify whether the subview should be resized.
- macOS 10.6+
The split view that sent the message.
The subview to resize.
YES if adjustSubviews can change the size of the subview, otherwise
NO. By returning
NO, you lock the size of the split view
subview while the split view is resized.
Regardless of the value returned by this method,
adjust may change the origin of the subview. Otherwise non-resizable subviews may also be resized in order to prevent an invalid subview layout.
If a split view has no delegate, or if its delegate does not respond to this message, the split view behaves as if this method returns