D20766: Use appropriate background color for text previews

[Eugene Shalygin]

eshalygin marked an inline comment as done.

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

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