Restructure code to minimize temporary allocations.
Review Request #121407 - Created Dec. 9, 2014 and submitted
|dvratil, mlaurent, vkrause|
In EntityMimeTypeFilterModel::filterAcceptsRow, we can check the mimetype first, before checking whether the item has a payload. The latter requires a temporary data allocation inside QVariant for the Akonadi::Item, whereas the former can leverage the optimized QVariant code for QString, which is faster.