D23990: [kcmutils] Port away from deprecated methods in Qt 5.14

[David Faure]

dfaure created this revision.
dfaure added reviewers: apol, ngraham, davidedmundson.
Herald added a project: Frameworks.
Herald added a subscriber: kde-frameworks-devel.
dfaure requested review of this revision.

TEST PLAN
  Builds. If there were any unittests, I would have run them...
  If there was a maintainer, I would have added him as reviewer...
  Many things one could do, with "ifs" ;-)

REPOSITORY
  R295 KCMUtils

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D23990

AFFECTED FILES
  src/kcmultidialog.cpp
  src/kpluginselector.cpp
  src/ksettings/dialog.cpp

To: dfaure, apol, ngraham, davidedmundson
Cc: kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns
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