Make IDocument::fileName a member with setter.
Instead of requiring subclasses to implement a method. Also renames IDocument::rename to IDocument::setFileName, since it doesn't really rename any files or such. Change-Id: I1344025c24d2f74a6a983e04fb0a5245f1f37aad Reviewed-by: Daniel Teske <email@example.com> Reviewed-by: Eike Ziller <firstname.lastname@example.org>
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