Merges the fields that are set in @desc_to_merge into the fields in
@desc.
If @replace_existing is %FALSE, only fields in @desc that
are not already set are affected. If %TRUE, then fields that are
already set will be replaced as well.
If @desc_to_merge is %NULL, this function performs nothing.
Merges the fields that are set in @desc_to_merge into the fields in @desc.
If @replace_existing is %FALSE, only fields in @desc that are not already set are affected. If %TRUE, then fields that are already set will be replaced as well.
If @desc_to_merge is %NULL, this function performs nothing.