D23842: [KCompletion] Port away from deprecated methods in Qt 5.14

[David Faure]

dfaure created this revision.
dfaure added reviewers: cfeck, dhaumann, aacid.
Herald added a project: Frameworks.
Herald added a subscriber: kde-frameworks-devel.
dfaure requested review of this revision.

REVISION SUMMARY
  the QComboBox::activated(QString) signal being deprecated
  and optionally non-existent makes this interesting in subclasses trying
  to emit it.

TEST PLAN
  -DQT_DISABLE_DEPRECATED_BEFORE=0x060000, make, ctest
  and playing a bit with kcompletionuitest.

REPOSITORY
  R284 KCompletion

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D23842

AFFECTED FILES
  autotests/kcombobox_unittest.cpp
  src/kcombobox.cpp
  src/kcompletion.cpp
  src/kcompletionbox.cpp
  src/khistorycombobox.cpp
  src/klineedit.cpp
  src/ksortablelist.h
  tests/kcompletionuitest.cpp

To: dfaure, cfeck, dhaumann, aacid
Cc: kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns
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