D29519: Prevent showing outlines of notifications when the screen is locked

zzag created this revision.
zzag added a reviewer: KWin.
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REVISION SUMMARY
  When the screen is locked, all visible windows are passed through the
  effects system, but only the lockscreen greeter window is going to be
  painted. Thus, we need to disable effects such background contrast or
  blur that alter background behind notification windows.
  
  BUG: 420802

REPOSITORY
  R108 KWin

BRANCH
  screenlock-notification-outlines

REVISION DETAIL
  https://phabricator.kde.org/D29519

AFFECTED FILES
  effects/backgroundcontrast/contrast.cpp
  effects/backgroundcontrast/contrast.h
  effects/blur/blur.cpp
  effects/blur/blur.h

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