D25891: fix preview of plain text files when using dark theme

[Ilia Kats]

iliakats created this revision.
Herald added projects: Dolphin, Frameworks.
Herald added subscribers: kfm-devel, kde-frameworks-devel.
iliakats requested review of this revision.

REVISION SUMMARY
  When using a dark theme, plain text files without an associated highlighting theme are rendered in white on a white background (see also bugs 409380 and 406821). This patch forces a re-highlighting of the preview after the theme is set and before it is drawn into the preview area.

TEST PLAN
  opened dolphin, checked several text files for correct preview colors

REPOSITORY
  R320 KIO Extras

REVISION DETAIL
  https://phabricator.kde.org/D25891

AFFECTED FILES
  thumbnail/textcreator.cpp

To: iliakats
Cc: kde-frameworks-devel, kfm-devel, pberestov, iasensio, fprice, LeGast00n, MrPepe, fbampaloukas, alexde, GB_2, Codezela, feverfew, meven, michaelh, spoorun, navarromorales, firef, ngraham, andrebarros, bruns, emmanuelp, mikesomov
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