D18787: Sort preview plugins case-insensitively

[Nathaniel Graham]

ngraham accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R318 Dolphin

REVISION DETAIL
  https://phabricator.kde.org/D18787

To: broulik, #dolphin, #vdg, ngraham
Cc: kfm-devel, alexde, feverfew, spoorun, navarromorales, firef, andrebarros, emmanuelp, mikesomov
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