Since 5.2, you must consider this struct as opaque. Any access to its internal must use public API. Don't try to use #gda_set_group_free on a struct that was created manually.
list of GdaSetNode, at least one entry
if NULL, then @nodes contains exactly one entry
Since 5.2, you must consider this struct as opaque. Any access to its internal must use public API. Don't try to use #gda_set_group_free on a struct that was created manually.