D20766: Use appropriate background color for text previews

[Friedrich W. H. Kossebau]

kossebau added a reviewer: cfeck.

REVISION DETAIL
  https://phabricator.kde.org/D20766

To: eshalygin, kossebau, cfeck
Cc: cfeck, meven, broulik, kde-frameworks-devel, kfm-devel, alexde, feverfew, michaelh, spoorun, navarromorales, firef, ngraham, andrebarros, bruns, emmanuelp, mikesomov
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