D8246: Preallocate space when unfolding headers

[Volker Krause]

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

REPOSITORY
  R180 PIM: KMime

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D8246

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