D9823: Optimize: use QMetaObject::invokeMethod with functor

[Aleix Pol Gonzalez]

apol added a comment.


  Maybe it would be cleaner to do `QTimer::singleShot(0, c.instance, lambda)`.

REPOSITORY
  R244 KCoreAddons

REVISION DETAIL
  https://phabricator.kde.org/D9823

To: mwolff, dfaure, apol
Cc: #frameworks