D26922: Port away from a deprecated signal

zzag created this revision.
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REVISION SUMMARY
  QProcess::error() has been deprecated since Qt 5.6. It is highly advised
  to use QProcess::errorOccurred() instead.

TEST PLAN
  Compiles.

REPOSITORY
  R108 KWin

BRANCH
  port-away-from-qprocess-error-signal

REVISION DETAIL
  https://phabricator.kde.org/D26922

AFFECTED FILES
  keyboard_layout.cpp
  rules.cpp
  useractions.cpp
  xwl/xwayland.cpp

To: zzag, #kwin
Cc: kwin, Orage, LeGast00n, The-Feren-OS-Dev, 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