Berthold Stoeger 92ad7865d0 Make thumbnail code threadsafe
The thumbnailing in qt-models/divepicturemodel.cpp was performed
concurrently, but the thumbnailCache was not protected from races.
Resolve this by guarding the thumbnalCache accesses with mutexes.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
2017-12-10 15:00:53 +01:00
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