Useful when the same file can appear more than once
(e.g. staged + modified)

Task-number: QTCREATORBUG-5347
Change-Id: I3ce716c22840c149490e00e6948612607ae57159
Reviewed-by: Petar Perisin <petar.perisin@gmail.com>
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>