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The LimitHeaders function is used to optionally reduce memory usage of aerc by only keeping certain headers in memory for the message list. The function properly deletes header keys and values from the underlying object, however the underlying data structure has a map and a slice - which do not get resized after deletion: resulting in no actual memory savings. Create a new header and add only the headers we want to it. Return this value and use in the MessageInfo struct. Signed-off-by: Tim Culverhouse <tim@timculverhouse.com> Acked-by: Robin Jarry <robin@jarry.cc>