Currently if you have a feature which was promoted from an idea and convert that feature to a requirement within another feature, the idea link is dropped entirely. You then have to manually relink the idea to the target feature under which the requirement was added.
Instead, when a feature is converted to a requirement, the idea should go with it and become linked to the new parent feature by default. I would always want this to happen when converting features to requirements so that I don't lose track of the various ideas that were associated with the feature.