D9823: Optimize: use QMetaObject::invokeMethod with functor

[Aleix Pol Gonzalez]

apol added a comment.


  In https://phabricator.kde.org/D9823#189491, @mwolff wrote:
  
  > cleaner, yes. but also much slower. contrary to the other code-paths, the `QTimer::singleShot` taking a functor is not optimized (yet?) for `timeout == 0`...
  
  
  Oh well... `¯\_(ツ)_/¯`

REPOSITORY
  R244 KCoreAddons

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

To: mwolff, dfaure, apol
Cc: #frameworks
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