D19116: [effects/desktopgrid] Don't copy windows on X11

zzag created this revision.
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REVISION SUMMARY
  So far the Desktop Grid effect was trying to copy a client when moving
  it. But on X11 it doesn't make sense because a client can't be on
  multiple desktops (except on all).
  
  BUG: 404442
  FIXED-IN: 5.15.X

REPOSITORY
  R108 KWin

BRANCH
  dont-copy-windows-on-x11

REVISION DETAIL
  https://phabricator.kde.org/D19116

AFFECTED FILES
  effects/desktopgrid/desktopgrid.cpp

To: zzag, #kwin
Cc: kwin, jraleigh, GB_2, mkulinski, ragreen, jackyalcine, Pitel, iodelay, bwowk, ZrenBot, ngraham, alexeymin, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart