D8802: Simplify FavoriteCollectionsModel: inherit KSelectionProxyModel

[David Faure]

dfaure created this revision.
dfaure added reviewers: dvratil, cmollekopf.
Restricted Application added a project: KDE PIM.

REVISION SUMMARY
  instead of inheriting from Akonadi::SelectionProxyModel and disabling
  the very little that Akonadi::SelectionProxyModel does compared to
  its base class, KSelectionProxyModel.
  
  And add a comment about why QSortFilterProxyModel wouldn't do,
  replacing the comment that we should inherit from that instead.

TEST PLAN
  Favorites work like before. The code is cleaner :)

REPOSITORY
  R165 Akonadi

BRANCH
  kselectionproxymodel

REVISION DETAIL
  https://phabricator.kde.org/D8802

AFFECTED FILES
  src/core/models/favoritecollectionsmodel.cpp
  src/core/models/favoritecollectionsmodel.h

To: dfaure, dvratil, cmollekopf
Cc: #kde_pim, dvasin, winterz, vkrause, mlaurent, knauss, dvratil
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