D27456: Fix misplaced client windows

zzag created this revision.
zzag added a reviewer: KWin.
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REVISION SUMMARY
  This regression was introduced by me, sorry. The client window may be at
  location other than (0, 0), in which case we have to move it to (0, 0)
  to ensure that the client contents is not covered by window frame.
  
  BUG: 417584
  FIXED-IN: 5.18.1

REPOSITORY
  R108 KWin

BRANCH
  misplaced-client-window

REVISION DETAIL
  https://phabricator.kde.org/D27456

AFFECTED FILES
  x11client.cpp

To: zzag, #kwin
Cc: kwin, Orage, 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