D5724: messagelist: fix horizontal scrollbar when applying column sizes

[Laurent Montel]

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

REPOSITORY
  R94 PIM: Message Library

BRANCH
  Applications/17.04

REVISION DETAIL
  https://phabricator.kde.org/D5724

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