D12019: make sure to create unique filename in maildir resource

[Sandro Knauß]

knauss added a comment.


  But the whole createUniqueFileName is not supposed to generate unique names anyways, as it is used in a do loop in Maildir::addEntry. I think be better approach to add to mutex, to garantee 
  QFile::exists(key) || QFile::exists(finalKey) || QFile::exists(curKey)  is valid. Maybe we should touch the file in tmp dir immediately.  And than it is irrelevant if we use a not so good createUniqueFileName.

REPOSITORY
  R44 KDE PIM Runtime

REVISION DETAIL
  https://phabricator.kde.org/D12019

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