When provided by the host, the UI may call this function to inform the
host about the size of the UI.
When provided by the UI, the host may call this function to notify the
UI that it should change its size accordingly. In this case, the host
must pass the LV2UI_Handle to provide access to the UI instance.
Request/advertise a size change.
When provided by the host, the UI may call this function to inform the host about the size of the UI.
When provided by the UI, the host may call this function to notify the UI that it should change its size accordingly. In this case, the host must pass the LV2UI_Handle to provide access to the UI instance.
@return 0 on success.