D9931: Remember expanded status of tree view in statistics main window

[Hartmut Riesenbeck]

This revision was automatically updated to reflect the committed changes.
Closed by commit R340:1a90ddebd9e1: Remember expanded status of tree view in statistics main window (authored by hriesenbeck).

REPOSITORY
  R340 Parley

CHANGES SINCE LAST UPDATE
  https://phabricator.kde.org/D9931?vs=25560&id=25956

REVISION DETAIL
  https://phabricator.kde.org/D9931

AFFECTED FILES
  src/settings/documentsettings.kcfg
  src/statistics/lessonstatisticsview.cpp
  src/statistics/lessonstatisticsview.h
  src/statistics/statisticsmainwindow.cpp
  src/statistics/statisticsmodel.cpp
  src/statistics/statisticsmodel.h

To: hriesenbeck, #kde_edu, aacid
Cc: aacid, narvaez, apol
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