Berthold Stoeger 66aeaddd0f Filter: cache number of dives fulfilling filter rules
Currently, in FilterModelBase::data() the number of dives is recalculated.
This happens for every mouse-over event!

Calculate the number of dives only on recalculation and store the count
in the items-struct.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
2018-08-28 05:03:59 -07:00
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