D18798: [KIO/drag and drop] Fix file and folder drag and drop popup menu transparency

[Anthony Fieroni]

anthonyfieroni added a reviewer: davidedmundson.

REPOSITORY
  R241 KIO

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D18798

To: anemeth, #frameworks, kde-frameworks-devel, ngraham, davidedmundson
Cc: ngraham, kde-frameworks-devel, michaelh, bruns