taglib/taglib — pull request #324 by TsudaKageyu (2013-12-01 00:17:03+00:00)
Title: Added a missing detach() to List<T>::find()

Fixes the case like this:
```
List l1; // { 1, 2, 3, 4, 5 };
List l2 = l1;
List::Iterator it = l2.find(3); // Logically, it points l2[2]. Not l1[2].
*it = 33; // This modifies not only l2[2] but also l1[2].
```