D17010: Make sure the unified mailbox dialog is only really shown once

[David Faure]

dfaure accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R206 KMail

BRANCH
  Applications/18.12

REVISION DETAIL
  https://phabricator.kde.org/D17010

To: dvratil, mlaurent, dfaure
Cc: kde-pim, dvasin, rodsevich, winterz, vkrause, mlaurent, knauss, dvratil
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