D23308: Add a warning message about needing globally installed theme files

[Filip Fila]

filipf created this revision.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
filipf requested review of this revision.

REVISION SUMMARY
  Settings sync only works for theme files that are installed globally.
  
  We should add a warning message so users aren't confused when some aspect of the feature doesn't work.

REPOSITORY
  R123 SDDM Configuration Panel (KCM)

BRANCH
  sync-warning (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D23308

AFFECTED FILES
  src/advanceconfig.cpp
  src/ui/advanceconfig.ui

To: filipf
Cc: plasma-devel, LeGast00n, The-Feren-OS-Dev, jraleigh, fbampaloukas, GB_2, ragreen, Pitel, ZrenBot, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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