This adds @parent as a parent for @object. Having one ore more parents affects the
writability of @object: if a @parent is not writable, @object is also not
writable, regardless of its refcount. @object is only writable if all
the parents are writable and its own refcount is exactly 1.
Note: This function does not take ownership of @parent and also does not
take an additional reference. It is the responsibility of the caller to
remove the parent again at a later time.
This adds @parent as a parent for @object. Having one ore more parents affects the writability of @object: if a @parent is not writable, @object is also not writable, regardless of its refcount. @object is only writable if all the parents are writable and its own refcount is exactly 1.
Note: This function does not take ownership of @parent and also does not take an additional reference. It is the responsibility of the caller to remove the parent again at a later time.