D19903: Fix build with msvc

[Albert Astals Cid]

aacid added a comment.


  Which MSVC is that? it seems the decltype change is workarounding non C++14 support?

REPOSITORY
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REVISION DETAIL
  https://phabricator.kde.org/D19903

To: vonreth, mlaurent, davidedmundson, aacid
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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