D15498: Workaround QTBUG-47066 to fix crash on startup

[Fabian Vogt]

fvogt created this revision.
fvogt added a reviewer: Plasma.
Herald added a project: Plasma.
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REVISION SUMMARY
  The lambda returns a QStringBuilder which contains dangling references.
  Work around that by converting to QString inside the lambda's context.

TEST PLAN
  Does not crash anymore.

REPOSITORY
  R123 SDDM Configuration Panel (KCM)

BRANCH
  Plasma/5.12

REVISION DETAIL
  https://phabricator.kde.org/D15498

AFFECTED FILES
  src/sddmkcm.cpp

To: fvogt, #plasma
Cc: plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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