D14454: Port to setAutoSaveSettings so that saving happens before hiding.

[David Faure]

dfaure added a reviewer: mlaurent.

REPOSITORY
  R206 KMail

REVISION DETAIL
  https://phabricator.kde.org/D14454

To: dfaure, ngraham, elvisangelaccio, broulik, cfeck, mlaurent
Cc: kde-pim, dvasin, rodsevich, winterz, vkrause, mlaurent, knauss, dvratil
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