D19255: Only commit XdgOutput::done if changed

[David Edmundson]

davidedmundson edited the summary of this revision.

REPOSITORY
  R127 KWayland

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D19255

To: davidedmundson, #kwin, romangg
Cc: romangg, kde-frameworks-devel, michaelh, ngraham, bruns