D21016: KCalCore : Clang-Tidy performance-unnecessary-copy-init fixes

[Volker Krause]

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


  Looks safe to me, the const ref changes only seem to refer to containers that aren't changed afterwards.

REPOSITORY
  R172 KCalendar Core

REVISION DETAIL
  https://phabricator.kde.org/D21016

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