D29253: [wayland] Pass command line arguments to launched processes

zzag created this revision.
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REVISION SUMMARY
  Since QProcess::setProgram() doesn't split the command, we need to do it
  ourselves.

TEST PLAN
  dbus-run-session kwin_wayland "kate foo.txt" works again.

REPOSITORY
  R108 KWin

BRANCH
  split-args

REVISION DETAIL
  https://phabricator.kde.org/D29253

AFFECTED FILES
  main_wayland.cpp

To: zzag, #kwin
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