Does XiphComment::pictureList() not work for flac files?

[Martin Brodbeck]

For some reason the new XiphComment::pictureList() (taglib 1.11) for flac files 
returns an empty list and I have to use FLAC::File::pictureList(). Whereas 
with ogg vorbis or opus files XiphComment::pictureList() works as expected. I'm 
not sure if this behaviour is intended?
(I noticed that hexdump shows no METADATA_BLOCK_PICTURE in my flac files but 
they do have xiph comments).

Regards
Martin