D6016: Don't warn when attempting to remove a MainWindow container

[Elvis Angelaccio]

elvisangelaccio created this revision.
Restricted Application added a project: Frameworks.
Restricted Application added a subscriber: Frameworks.

REVISION SUMMARY
  MainWindow is a valid element that can contain other elements. We
  shouldn't print a warning in this case.

TEST PLAN
  latest ark git master (which has a <Menu> child of <MainWindow>) no longer prints:
  
    Unhandled container to remove :  MainWindow
  
  when the app is closed.

REPOSITORY
  R263 KXmlGui

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D6016

AFFECTED FILES
  src/kxmlguibuilder.cpp

To: elvisangelaccio, dfaure
Cc: #frameworks
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