D24803: Let Qt handle sub-window icons

[Volker Krause]

vkrause added a reviewer: KDE PIM.

REPOSITORY
  R90 PIM: Kleo Library

REVISION DETAIL
  https://phabricator.kde.org/D24803

To: vkrause, #kde_pim
Cc: kde-pim, fbampaloukas, dvasin, rodsevich, winterz, vkrause, mlaurent, knauss, dvratil
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