D27170: delay show window

[Marco Martin]

mart created this revision.
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REVISION SUMMARY
  show the window only after mainWidget() of the view has been called.
  mainWidget creates the ui on demand, so at that point the qml scene will be there

TEST PLAN
  no more empty window for some instants on startup

REPOSITORY
  R124 System Settings

BRANCH
  phab/delaystart

REVISION DETAIL
  https://phabricator.kde.org/D27170

AFFECTED FILES
  app/SettingsBase.cpp
  app/main.cpp

To: mart, #plasma
Cc: plasma-devel, Orage, LeGast00n, The-Feren-OS-Dev, cblack, jraleigh, zachus, fbampaloukas, GB_2, ragreen, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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