D8818: Use EntityCollectionOrderProxyModel for filtering folders.

[David Faure]

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

REVISION SUMMARY
  This way the FolderTreeWidgetProxyModel (its source) doesn't get
  filtered, which will allow FavoriteCollectionsModel to not get filtered
  by the filter lineedit (once it uses FolderTreeWidgetProxyModel
  directly).
  
  This also simplifies FolderTreeWidgetProxyModel.

TEST PLAN
  lineedit filtering in kmail still works

REPOSITORY
  R92 PIM: Common Mail Support

BRANCH
  Applications/17.12

REVISION DETAIL
  https://phabricator.kde.org/D8818

AFFECTED FILES
  src/folder/foldertreewidget.cpp
  src/folder/foldertreewidgetproxymodel.cpp
  src/folder/foldertreewidgetproxymodel.h

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