D28293: [kcmkwin] Make dialog non blocking

davidedmundson created this revision.
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REVISION SUMMARY
  It's invoked from QML.
  
  Nested event loops invoked directly from QML is asking for crashes.
  
  BUG: 419118

TEST PLAN
  Opened KCM
  Opened dialog for some settings
  Window was still modal as before
  Settings were saved 
  (though they didn't seem to be applied..maybe another bug?)

REPOSITORY
  R108 KWin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D28293

AFFECTED FILES
  kcmkwin/common/effectsmodel.cpp

To: davidedmundson, #kwin
Cc: kwin, Orage, cacarry, LeGast00n, The-Feren-OS-Dev, cblack, jraleigh, zachus, fbampaloukas, GB_2, mkulinski, ragreen, jackyalcine, iodelay, crozbo, bwowk, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, hardening, romangg, jensreuterberg, abetts, sebas, apol, ahiemstra, mart