The code used the if (!contains()) { insert() } anti-pattern, necessitated by Qt's deviation from the STL of allowing insert() to overwrite an existing entry, causing two lookups of the same key. Fix by recording the size prior to the execution of the indexing operator and taking a size increase as the cue to populate the (new) entry. This way, we look up the key only once. Also fix two instances of double lookup caused by the if (contains()) { value() } anti-pattern. Change-Id: I961fe45ec571aa94aff5dd578f2276e7b74d800d Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>