D24086: Don't initialize QFlags<T> with nullptr

zzag created this revision.
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REVISION SUMMARY
  This looks very odd.

TEST PLAN
  Compiles.

REPOSITORY
  R108 KWin

BRANCH
  fix-initialization-of-qflags

REVISION DETAIL
  https://phabricator.kde.org/D24086

AFFECTED FILES
  client.cpp
  effects/desktopgrid/desktopgrid_config.cpp
  effects/trackmouse/trackmouse.cpp
  events.cpp
  geometry.cpp
  group.cpp
  kcmkwin/kwinrules/ruleswidget.cpp
  manage.cpp
  utils.cpp

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